US20020171177A1 - System and method for printing and supporting three dimensional objects - Google Patents

Abstract

A method for printing and supporting a three-dimensional (3-D) object is provided. The method of printing can include dispensing a first interface material for the construction of the three-dimensional object, dispensing a second interface material to form a support structure for supporting the three-dimensional object and dispensing a third interface material which may be used to separate the support structure from the 3-D object Disclosed also a method for producing a 3-D model containing various kinds of inserts.

Description

PRIOR PROVISIONAL APPLICATION
• The present application claims benefit from prior U.S. provisional application serial No. 60/277,259, filed Mar. 21, 2001, entitled “SYSTEM AND METHOD FOR PRINTING AND SUPPORTING THREE DIMENSIONAL OBJECTS”.[0001]
FIELD OF THE INVENTION
• This present invention relates to printing 3-D (Three-Dimensional) objects in general and to supporting complex 3-D structures in particular.[0002]
BACKGROUND OF THE INVENTION
• 3-D printing, which generally works by building parts in layers, is a process used for the building up of 3-D objects. 3-D printing is relatively speedy and flexible allowing for the production of various objects as prototype parts and tooling directly from, for example, a CAD (Computer Aided Design) file.[0003]
• Using 3-D printing enables the manufacturer to obtain a full 3-D model of any proposed product before tooling thereby possibly substantially reducing the cost of tooling and leading to a better synchronization between design and manufacturing.[0004]
• Embodiments for 3-D printing are described in U.S. patent application Ser. No. 09/259323 to the Assignees of the present application, and incorporated herein by reference Such embodiments include a dispensing apparatus including a printing head having a plurality of nozzles, which selectively dispenses interface material through the nozzles in layers and curing means for optionally curing each of the layers deposited. The depth of each deposited layer may be controllable by selectively adjusting the output from each of the plurality of nozzles.[0005]
• Embodiments for 3-D printing are also described in U.S. patent application Ser. No. 09/412,618. Some such embodiments include printing complex 3-D objects by using interface materials having different hardness or elasticity and mixing the interface material from each of the printing heads to control the hardness of the material forming the 3-D object.[0006]
SUMMARY OF THE INVENTION
• Embodiments of the present invention provide a method and system for printing a 3-D (Three-Dimensional) object and supporting the 3-D object during its construction.[0007]
• There is thus provided, in accordance with an embodiment of the present invention, a method and system of printing a 3-D object which includes the steps of dispensing a raw first interface material which will be referred to as building material, or briefly BM, directly to place for the construction of the 3-D object and (or not) for building part of the supporting structure of the 3-D object, dispensing a raw second interface material, which will be referred to as support material or briefly SM, to form the other part of the supporting structure, and applying a hardening process (e.g., curing) to the building and (or not) support materials. In addition, the immediate layer of a supporting structure that touches the 3-D object surface may be composed of support material only, so as to serve as a release layer between the 3-D object and the rest of the supporting structure.[0008]
• In addition, there is thus provided a method of increasing the viscosity of the building and or support materials by reducing the temperature of the materials after dispensing.[0009]
• In addition, there is thus provided a method of hardening the BM and (or not) SM by “curing” brought about by, for example, electromagnetic radiation to produce the (final) interface materials. Furthermore, in accordance with an embodiment of the present invention, the step of dispensing a BM includes the step of dispensing the BM in a plurality of layers, each layer being less than 10μ (micron) thick. The step of dispensing a SM includes the step of dispensing the raw SM in a plurality of layers, each layer being the same thickness as the layer of the BM.[0010]
• Additionally, the step of dispensing the BM may include the step of dispensing the SM as well.[0011]
• The final SM (FSM) has a different viscosity or hardness or cohesiveness from the final BM (FBM).[0012]
• In addition, there is thus provided a method of separating the support structure from the 3-D object thereby to produce the finished 3-D object. Further more, in accordance with an embodiment of the present invention, the step of separating includes the step of dissolving the FSM in a solvent.[0013]
• Alternatively, the step of separating includes the step of subjecting the FSM to radiation thereby to cause the support structure or part of it to, for example, turn to gas or liquid or powder. The radiation includes electromagnetic radiation at microwave wavelength, sonic radiation at ultrasonic wavelength or low frequency mechanical vibration.[0014]
• The FSM may be a fluid. In this case the step of separating includes the step of draining the FSM and/or washing the 3-D object with a solvent—in particular with water.[0015]
• The fluid may have the proper characteristics that are required to prevent deterioration of surface quality of the 3-D object due to mix of BM and SM at the interface layer between both. Such characteristics include having large surface tension between both raw materials, or being the raw SM compatible with the BM in respect of the hardening process of the BM (example: BM without initiator is being used as SM).[0016]
• The fluid may be soluble or dispersible in environmental friendly solvent or dispersant—in particular water. The fluid may be water or water solution or dispersion such as Poly Ethanol Glycol, Propylene Glycol, Glycerol.[0017]
• Furthermore, in accordance with an embodiment of the present invention, the support structure includes a container retaining the non self sustaining SM. The container includes a plurality of walls everywhere the FSM is adjacent to air and (or not) to the table, including (or not) the air above the FSM.[0018]
• The support structure may also include pillars and membranes that stabilize and support the 3-D object. A typical embodiment includes vertical pillars and horizontal membranes; each membrane is composed of one or few printed layers of BM, or BM and SM. The membrane may be full or screen-like in such that it comprises of thin beams that connect the pillars to each other. The pillars and or membranes may or may not connect the 3-D object to the container's walls or base, or connect parts of the 3-D object to each other. The membranes also connect pillars to each other. The material of container, pillars and membranes may be viscous or cohesive and harder than the FSM material, and may be composed of, for example, FBM, or of a mix of BM and SM, or a separate material.[0019]
• One special case of using horizontal membranes is when a layer includes an island. Island is defined as any part of the object, which is not connected to the object from beneath. The bottom part of the object is an example of an island The membrane stretches out of the island circumference to a certain extent and is connected to the pillars from below, or is connected to the adjacent walls.[0020]
• The support structure may also include a fine mix of BM and SM in a way that the mix is even substance with hardness, flexibility and cohesiveness between the fluid SM and the cured BM. One way of achieving such a mix is printing fine pillars of BM surrounded by SM. The support structure may also include a layer of SM between the 3-D object and the mixed substance for releasing purposes[0021]
• Furthermore, one edge of support pillar or membrane may contact or be adjacent to the 3-D object being supported. When in contact, the edge may be tapered or thinned.[0022]
• There may be, for example, four sets of grids or membranes: Base, extra, island and fine. A base grid may be built where there is vertical “line of sight” to the table. An extra may be the grid of the extra support section. An island may be formed below islands and the very immediate vicinity. A fine grid may be formed elsewhere. The container and connecting walls may be formed in such a way that they are easily separable from the 3-D object. Hence they may be formed of thin layer of FBM, the layer may be reinforced by columns, or thick layer with thin “break lines” and sharp edges where the wall is connected to the object, or thick layer which is composed of a mix of BM and SM.[0023]
• Furthermore the raw SM may be flooded into place instead of directly dispensed into place after or before the raw BM is dispensed into place.[0024]
• Furthermore the 3-D object during printing may be partially sunk in a bath of raw SM, and the raw BM may be dispensed into place. After each slice (e.g., printed layer) the table supporting the object sinks so that only the very top of the printed object protrudes above the SM. The table may sink before this step even more in order to enable the SM flowing to any open space between the printed object parts.[0025]
• Furthermore, in accordance with an embodiment of the present invention, the method further includes the steps of curing the BM for a first period of time and at a first electromagnetic radiation wavelength to obtain a first modulus of elasticity and curing or not the SM for a second period of time and at a second radiation wavelength to obtain a second modulus of elasticity. The radiation wavelength and time length of both may be equal.[0026]
• Furthermore, in accordance with an embodiment of the present invention, a method of printing 3-D models containing various kinds inserts is presented.[0027]
• These inserts may be rigid, semi-rigid or flexible and may be produced from various materials. The inserts may installed during the printing process as will be explained herein.[0028]
BRIEF DESCRIPTION OF THE DRAWINGS
• The present invention will be understood and appreciated more fully from the following detailed description taken in conjunction with the appended drawings in which:[0029]
• FIG. 1 is a schematic sectional elevational view of a release/support structure for use in the construction of a 3-D object, constructed and operative in accordance with a preferred embodiment of the present invention;[0030]
• FIG. 2 is an enlarged detail of a layer of the 3-D object of FIG. 1;[0031]
• FIG. 3 is a schematic illustration of an embodiment of the 3-D printing system for use in constructing the 3-D object and release/support structure of FIG. 1;[0032]
• FIG. 4-A is a schematic cross-sectional elevational view of a further embodiment of release/support structure for a 3-D object;[0033]
• FIG. 4-B is an enlarged detail showing the support pillar for the 3-D object according to an embodiment of the present invention;[0034]
• FIG. 4-C depicts another embodiment of a pillar end used to support a cantilever of a 3-D model according to an embodiment of the present invention;[0035]
• FIG. 5 depicts a schematic cross-sectional view of a yet further embodiment of release/support structure for a 3-D model;[0036]
• FIG. 6-A is an enlarged detail of part of a container and a membrane forming the support structure of FIG. 5;[0037]
• FIG. 6-B is an plan view of a serration used to support a thin section of a model according to an embodiment of the present invention;[0038]
• FIG. 7 is a complex of pillars and membranes used to support a printed model according to an embodiment of the present invention;[0039]
• FIG. 8-A is a model containing a flat insert according to an embodiment of the present invention;[0040]
• FIG. 8-B is the base of a part when an insert is introduced according to an embodiment of the present invention;[0041]
• FIG. 9-A is a model containing an internal graduated insert according to an embodiment of the present invention;[0042]
• FIG. 9-B is the lower section of[0043]part140 when the insert is introduced according to an embodiment of the present invention;
• FIG. 10-A is a model containing a skew insert according to an embodiment of the present invention; and[0044]
• FIG. 10-B is the lower section of[0045]part150 when the skewed insert is inserted.
DETAILED DESCRIPTION OF THE PRESENT INVENTION
• In the following description, various aspects of the present invention will be described. For purposes of explanation, specific configurations and details are set forth in order to provide a thorough understanding of the present invention. However, it will also be apparent to one skilled in the art that the present invention may be practiced without the specific details presented herein. Furthermore, well-known features may be omitted or simplified in order not to obscure the present invention.[0046]
• List of Definitions:[0047]
• The following definitions are used in this Application:[0048]
• Object layer (or component) or model layer: a layer of BM (building material) included in the 3-D object;[0049]
• Support layer (or component)—a layer of SM (support material) for supporting the 3-D object layer and not included in the 3-D object;[0050]
• Release layer (or component)—a layer of interface material for separating the 3-D object layer from components, such as the support layer, not included in the 3-D object.[0051]
• Reference is now made to FIG. 1, which is. a schematic cross sectional view of a release/support structure according to an embodiment of the present invention, generally referenced[0052]50, for a 3-D element52 (shown hatched) being constructed.
• [0053]Element52, set on a table54, is shown as being a slim upright object having dimensions, whose height H is typically a large multiple of its width (W), In the example of FIG. 1, H≡15×W. Other dimensions and proportions may be used.
• As will be appreciated, a slim upright object such as[0054]element52 is likely to snap much more easily than a wider based object. Thus, in order to ensure that 3-D element does not break or snap during printing, 3-D element52 may be supported during construction. Surrounding the 3-D element52 may be a shapedsupport structure60 that ensures that the 3-D object is adequately braced.
• [0055]Element52 is preferably constructed in layers, utilizing suitable apparatus such as embodiments described in U.S. patent applications Ser. Nos. 09/259323 and/or 09/412,618, assigned to the Assignees of the present application, and incorporated herein by reference. Other 3-D modeling apparatuses may be used. For clarity, only three layers, referenced58A,58B and58C are shown. It will be appreciated that 3-D element52 is constructed in a plurality of layers, approximately 10μ-20μ thick. Other dimensions may be used.
• As shown in the enlarged detail of layer[0056]58B in FIG. 2, each layer comprisessupport material58,building material52 andrelease material56, Each of thesupport material58,building material52 andrelease material56 may be, for example, a photopolymer or other substance that is curable. Curing may be done by, for example, electromagnetic radiation (e.g., X rays, UV rays, visible light, IR radiation, microwave radiation, radio frequencies, etc.). Other curing methods, such as electron beam curing, may be used. Different substances may be used, and different curing methods may be used.
• Briefly, embodiments described in U.S. patent application Ser. No. 09/259323 describe apparatus including a printing head having a plurality of nozzles, a dispenser connected to the printing head for selectively dispensing interface material in layers and curing apparatus for optionally curing each of the layers deposited. The depth of each deposited layer may be controllable by selectively adjusting the output from each of the plurality of nozzles.[0057]
• Embodiments described in U.S. patent application Ser. No. 09/412,618 include a system and a method for printing complex 3-D objects by using interface material having different hardness or elasticity and mixing the interface material from each of the printing heads to control the hardness of the material forming the 3-D object.[0058]
• Reference is now briefly made to FIG. 3, which is a schematic illustration of a 3-D printing system according to an embodiment of the present invention, generally designated[0059]10.
• In one embodiment, the 3-[0060]D printing system10 includes aprinting head12 having a plurality of ink-jet nozzles14, through whichinterface material16 is jetted and acuring unit18 for curing theinterface material16 to form the 3-D element52. The 3-D printing system10 further comprises aprocess controller24 connected to and controlling theprinting head12 and curingunit18 as well as to aCAD system26.CAD system26 prepares and outputs the data for the 3-D object being produced.
• A[0061]single printing head12 may be used for dispensing thebuilding material52,support material58 andrelease material56 by allocating different nozzles for each of the different materials. Alternatively, separate printing heads may be used for each material. The support layer may be constituted from, for example, a separate material, from the material used for the release layer, from a mixture of release layer material and support layer material, or from any suitable combination of materials having sufficient strength to provide support to the build layers.
• The 3-[0062]D element52 is build up in layers. In one embodiment, the depth of each layer is controllable by, for example, selectively adjusting the output from each of the plurality of ink-jet nozzles14.
• As described in U.S. patent application Ser. No. 09/412,618, an object can be supported during printing by concurrently printing support material using a mixture having a different hardness or elasticity from the mixture forming the 3-[0063]D element52. Thus, in the example of FIG. 1, 3-D element52 can be supported, for example, by a conical shapedsupport structure50. The shapedsupport structure50, is preferably constituted from material having mix proportions different from the constructed 3-D element52.
• In one embodiment, the shaped[0064]support structure50 may be released by suitable means consistent with the composition of the support structure. For example, by dissolving shapedsupport structure50 in water or other solvent, or by subjecting the structure to mechanical vibrations, or alternatively, subjecting the shapedsupport structure50 to ‘energy bombardment’, such as from microwaves, which would cause the shapedsupport structure50 to weaken; for example to turn to gas, liquid or powder.
• Alternatively, in the embodiment shown in FIG. 2,[0065]release material56 can be used to separate the build material from the support material58B. The shapedsupport structure50 may be constituted from material having mix proportions similar to the constructed 3-D element52, provided that arelease layer56 is inserted between theshaped support structure50 and the constructed 3-D element52. In this case, the release layer is generally softer than both the shapedsupport structure50 and the constructed 3-D element52. Thesupport structure50 can then be easily separated from the 3-D element52.
• In one embodiment, the release layer has a modulus of elasticity different from those of the support structure and the build material (typically, when measured after deposition and possibly after curing, if curing is used). In certain embodiments, such modulus of elasticity may be measured after a weakening agent (e g., solvent, radiation, temperature) is applied. Typically, the modulus of elasticity for the release layer is lower than both the support and release material (which may or may not have the same modulus of elasticity). The release layer may be constructed from, for example, a mix of support and build material, or may be constructed from a third, separate material.[0066]
• Reference is now made to FIG. 4-A which is a schematic cross-sectional view of a further embodiment of a release/support structure, generally referenced[0067]60 for a more ‘complex’ 3-D element,62. The example of 3-D element62 may be described as having a generally “I”-shape (as seen in cross-section), having a ‘fragile’foot63 supporting a wider ‘leg’64, which further supports cantilever ‘arms’66 and68.Cantilever arm66 is deeper thancantilever arm68, Thestructure60 is supported bysupport material70. Unless thesupport material70 is itself adequately retained (or sufficiently dense so as to be self-supporting), thesupport material70 may ‘spread’ or bulge thus causing both cantilever ‘arms’66 and68 to sag or curt.
• In the embodiment shown in FIG. 4-A, a secondary support, in the form of a[0068]container72, is used.Container72 may be a generally box-shaped structure having an open top, which may be jetted in the same manner as the 3-D element62 and thesupport material70. Other shapes for the container may be used.Container72 may be constituted so that it is sufficiently strong to retain thesupport material70. The use ofcontainer72 enables the use of a semi-fluid material, for example, for the support material layers. Thus, the support material may be any suitable low viscosity material capable of supporting the 3-D object being produced. Using low viscosity material as the support allows the 3-D object to be easily released by simply upending thecontainer72, thesupport layer70 also acting as a release material.
• The support material typically has a modulus of elasticity less than that of the container and the build object (typically when measured after dispensing or after curing). The modulus of elasticity of the container and build object may be the same The[0069]container72 may be constructed layer by layer concurrently with the construction of the 3-D object62 and the release/support70, as described in U.S. patent application Ser. No. 09/259323. Other methods may be used.
• Additional support pillars ([0070]74,76) may be added during construction (if required) for supporting the overhangs formed from cantilever ‘arms’66 and68. Reference is now made to FIG. 4-B, which is an enlarged detail of the corner of cantilever ‘arm’66 andsupport pillar76 according to an embodiment of the present invention.Support pillar76 may be constructed in layers during the construction ofcontainer72. Thesupport pillar76 is shown as ending a distance ‘d’ below the bottom layer of cantilever ‘arm’66. The distance ‘d’ is preferably the thickness of one or two layers, that is 20-50 microns. Alternatively, thepillar76 can be constructed up to the bottom layer of cantilever ‘arm’66, as shown in FIG. 4-C, the last layer being a single ink-jet ‘drop’. Thus, thesupport pillar76 acts to prevent thecantilever arm66 from sagging. In the embodiment of FIG. 4-B, the maximum ‘sag’ is thus the distance ‘d’ (that is, 20-50 microns).
• The last layers of the supporting[0071]pillar76 just below the cantilever ‘arm’66 may be narrowed, as shown in FIG. 4-B. Alternative configurations for the last layers include a point or any suitable formation, as shown in FIG,4-C, so as to ease breaking the support structure.
• Reference is now made to FIG. 5, which is a schematic cross-sectional view of a further embodiment of a release/support structure, generally referenced[0072]80. In the embodiment of FIG. 5, a ‘complex’ 3-D structure, generally designated82 is being constructed within a container-like retainer84. The 3-D structure comprises a ‘foot’86 supporting a ‘leg’87, which supports an upper ‘body’88. Upper ‘body’88 further comprises anib90 and a ‘mortise’92 cut into one part ofbody88. The material used to build the container may be, for example, the build material, or may be other material, such as a third material or a mix of BM and SM.
• The[0073]structure82 is supported bysupport material94, which is similar to supportmaterial70 described hereinabove with respect to FIG. 4-A.
• Reference is now also made to FIG. 6, which is an enlarged detail of[0074]nib90 according to an embodiment of the system and method of the present invention. Owing to thermal changes taking place during the construction of the interface material, there is a tendency for shrinkage to occur. The shrinkage, indicated byarrow95, may cause ‘curling’ to occur at the ends of the layers being deposited. This is shown in exaggerated detail by the dashed lines96. One technique to prevent ‘curling’ to occur is shown in the embodiment of FIGS.6-A and6-B, where the end ofnib90 is extended by disposing a fewthin serrations98, connected to the container-like retainer84. Theserrations98 act as restraints, preventing the upward curling of the edges of thenib90. Another technique of supporting athin nib102 at its lower side is shown in FIG. 5; dispensing a supportingnib100 as an integral part of thecontainer84, leaving a thin gap ‘F’, and dispensing SM or a release layer over it enables the formation of thethin nib102.
• Similar to the embodiment of FIG. 4-A, additional support pillars ([0075]102,103,104) may be added during construction for supporting thenib90 and the overhang formed from the upper ‘body’88. As described hereinabove with respect to thesupport pillar76 of FIG. 4-A, support pillars (102,103,104) may be constructed in layers during the construction ofcontainer84 ending a distance ‘d below the bottom layer ofcomponents88 and90, or ending by thinning or a point as shown in FIGS.4-B and4-C.
• Curing is preferably carried out after the deposition of each layer. However, alternatively, curing may be optionally deferred so that curing occurs after the deposition of more than one layer.[0076]
• Reference is made now to FIG. 7, depicting a cross sectional view of a 3-[0077]D model110 according to an embodiment of the present invention. According to this preferred embodiment the 3-D model110 is constructed layer by layer including acontainer118 andsupport material119.
• One or more pillars such as[0078]pillars120,122, and124 may be constructed in order to support theislands114 and116. The pillars are preferably made from the building material, but may be constructed from other material.
• Thin membranes like[0079]128,130,132, typically having at least thickness of a single layer, may also be dispensed and cured. These membranes may be used to stabilize the pillars by forming connection among them and by connecting them to the relativelyrigid container wall118. The membranes are preferably dispensed from the building material, but may be constructed from other material.
• The linkage of said[0080]membranes128,130 and132 to thecontainer wall118 may be continuous or byserrations98, as shown in FIGS. 6A and 6B, or may be by other methods.
• Membranes[0081]130 and132 are also forming the lower layer ofislands114 and116.
• Refer now to FIG,[0082]8-A which is an embodiment of a 3-D model130 comprising a curedBM part132 and aninsert134. Theinsert134 may be produced from a third material such as metal, plastic, wood or any other suitable material, or may be produced from build material, support material, or release material. The insert is preferably more rigid than the liquid or semi-liquid materials used to form the build object and support structures. According to an embodiment of the present invention, aplate134 havingthreads136, is inserted in the model, although any other suitable form could be used.
• The method of producing a model such like[0083]130, is by first dispensing the lower layers of themodel133, as shown in FIG. 8-B (the container not shown), where therecess135 is left uncured or filled with SM. Therecess135 may be built slightly larger than theinsert134. When the lower part of themodel133 has attained a thickness of the insert ‘T’, therecess135 is emptied from the uncured material, theinsert134 is inserted and the dispensing continues, filling the gaps between the curedpart133 and theinsert134.
• Reference is made now to FIG. 9-A which is still another embodiment of a method of producing a 3-D model having an embedded graduated[0084]insert144.
• The method of producing such a 3-D model is similar to that shown in FIG. 8-A; the lower part of the[0085]model142 is dispensed as shown in FIG. 9B, forming arecess145 which is uncured and slightly larger than theinsert146. When therecess145 has attained the form of theinsert144, the recess is emptied from the uncured support material, theinsert144 is inserted into therecess145 and dispensing the BM continues.
• Reference is made now to FIG. 10-A which is still another embodiment of a method of producing a 3-[0086]D model150 having an embeddedskewed insert154.
• The method of producing such a 3-D model is similar to that shown in FIG[0087]8-A; the lower part of themodel153 is dispensed as shown in FIG. 10-B, forming arecess155 which is uncured, filled with SM, (not shown) and slightly larger than theinsert154. When therecess155 has attained the form of theinsert154, the recess is emptied from the SM, theinsert154 is inserted into the recess and dispensing continues.
• It will be further appreciated that the present invention is not limited by what has been described hereinabove and that numerous modifications, all of which fall within the scope of the present invention, exist. Rather the scope of the invention is defined by the claims, which follow:[0088]

Claims (60)

1. A method for building three-dimensional objects, said method comprising:

dispensing a first material used to form at least the three-dimensional object;

dispensing a second material used to form at least part of a support structure; and

dispensing a third material between said 3-D object and said support structure to form a release layer.

2. The method ofclaim 1 wherein at least said first material is a photopolymer and at least the three-dimensional object is formed after being irradiated by electromagnetic radiation.

3. The method ofclaim 1 wherein said second material is a photopolymer and the support structure is formed after being irradiated by electromagnetic radiation.

4. The method ofclaim 1 wherein said third material is a photopolymer and the release layer is formed after being irradiated by electromagnetic radiation.

5. The method ofclaim 1 wherein said support structure comprises said first material.

6. The method ofclaim 1 wherein said second and third materials are the same substance.

7. The method ofclaim 1 wherein said release layer is softer than said support structure, and said support structure is softer than said 3-D object.

8. The method ofclaim 1 comprising separating said support structure and release layer from said 3-D object thereby to produce a three dimensional object comprised of said first material.

9. The method according toclaim 1, comprising subjecting said second material to a solvent or to radiation thereby to cause the support structure to weaken.

10. The method according toclaim 1, wherein said support structure and release layer are at least partly liquid or paste after curing.

11. The method according toclaim 1, where said support structure comprises a container capable of confining said support material.

12. The method according toclaim 1, further comprising constructing at least one support pillar of said first material within said support structure.

13. The method according toclaim 12, further comprising constructing at least one connecting membrane of first material attached to said at least one support pillar.

14. A system for building three-dimensional objects, said system comprising:

a controller, and

a jetting head capable of selectively dispensing:

a first material used to form at least the three-dimensional object;

a second material used to form at least part of a support structure; and

a third material between said 3-D object and said support structure used to form a release layer.

15. The system ofclaim 14 wherein at least said first material is a photopolymer and at least the three-dimensional object is formed after being irradiated by electromagnetic radiation.

16. The system ofclaim 14 wherein said second material is a photopolymer and the support structure is formed after being irradiated by electromagnetic radiation.

17. The system ofclaim 14 wherein said third material is a photopolymer and the release layer is formed after being irradiated by electromagnetic radiation.

18. The system ofclaim 14 wherein said support structure comprises said first material.

19. The system ofclaim 14, wherein said support structure and release layer are at least partly liquid or paste after curing.

20. The system ofclaim 14, where said support structure comprises a container capable of confining said support material.

21. A method for building three-dimensional objects, said method comprising:

dispensing a curable build material to form the 3-D object and part of the support structure;

dispensing a support material to form part of the support structure, the build material being solid after curing and the support material being liquid after curing; and

forming a support structure comprising a container capable of holding said support material

22. The method according toclaim 21, wherein said container comprises a base, a plurality of walls and an open top.

23. The method according toclaim 21, wherein said container comprises at least one nib projecting from at least one of said walls, wherein said at least one nib is capable of restraining the movement of a three dimensional object.

24. The method according toclaim 21, wherein said container comprises build material.

25. The method according toclaim 21, wherein each of said build material, support material and container are formed in layers.

26. A system for building three-dimensional objects, said system comprising:

a controller; and

a material dispenser capable of dispensing:

a curable build material to form the 3-D object and part of a support structure; and

a support material to form part of the support structure, the build material being solid after curing and the support material being liquid after curing; wherein the material dispenser is capable of forming a support structure comprising a container capable of holding said support material.

27. The system according toclaim 26, wherein said container comprises a base, a plurality of walls and an open top.

28. The system according toclaim 26, wherein said container comprises at least one nib projecting from at least one of said walls, wherein said at least one nib is capable of restraining the movement of a three dimensional object.

29. The system according toclaim 26, wherein said container material is identical to said build material.

30. The system according toclaim 26, wherein each of said build material, support material and container material are deposited in layers.

31. A method for building three-dimensional objects, said method comprising:

dispensing a build material;

dispensing a second material forming a support structure; and

constructing a support pillar to support an object comprised of said build material.

32. The method according toclaim 31, comprising constructing membranes connected to said support pillar.

33. The method according toclaim 31, wherein said at least one support pillar is comprised of said build material.

34. The method according toclaim 31, wherein said at least one support pillar is comprised of said build material and said second material.

35. The method according toclaim 31, wherein said at least one support pillar comprises a plurality of layers and wherein the topmost layer of said at least one support pillar is adjacent to an object being supported.

36. The method according toclaim 31, wherein said upper portion of said at least one support pillar is tapered.

37. The method according toclaim 31, wherein each of said build material, second material and pillar are deposited in layers.

38. The method according toclaim 31, wherein the topmost layer of said at least one support pillar comprises said second material.

39. The method according toclaim 31, wherein the topmost layer of said at least one support pillar comprises a third material, said third material being softer than the material forming the remainder of said at least one support pillar.

40. A system for building three-dimensional objects, said system comprising:

dispenser capable of dispensing:

a build material;

second material forming a support structure; and

said dispenser constructing a support pillar to support an object comprised of said build material.

41. The system according toclaim 40, wherein said dispenser is capable of material forming dispensing constructing membranes connected to said support pillar.

42. The system according toclaim 40, wherein said at least one support pillar is comprised of said build material.

43. The system according toclaim 40, wherein said at least one support pillar is comprised of said build material and said second material.

44. The system according toclaim 40, wherein said at least one support pillar comprises a plurality of layers and wherein the topmost layer of said at least one support pillar is adjacent to an object being supported.

45. The system according toclaim 40, wherein the topmost layer of said at least one support pillar comprises said second material.

46. The system according toclaim 40, wherein the topmost layer of said at least one support pillar comprises a third material, said third material being softer than the material forming the remainder of the pillar.

47. The system according toclaim 40, wherein said upper portion of said at least one support pillar is tapered.

48. The system according toclaim 40, wherein each of said build material, second material and pillar are deposited in layers.

49. A method for building three-dimensional objects, said method comprising:

dispensing a first material for the construction of the three-dimensional object;

dispensing a support material forming a support structure for supporting said three-dimensional object; and

inserting a support insert.

50. The method ofclaim 49 wherein the support insert comprises a third material.

51. The method ofclaim 49 wherein the support insert includes plastic.

52. The method ofclaim 49 wherein the support insert includes metal.

53. The method ofclaim 49 wherein the support insert is a plate shaped member.

54. The method ofclaim 49 wherein the support insert is a skewed member.

55. The method ofclaim 49 wherein the support insert includes at least threads.

56. The method ofclaim 49 wherein the support insert is flexible.

57. The method ofclaim 49 wherein the support insert is more rigid than the support material, after said support material is cured.

58. A system for building three-dimensional objects, said system comprising:

a build material jetting means for dispensing build material;

a support material jetting means for dispensing support material; and

a release material jetting means for dispensing release material between said built and support materials.

59. A system for building three-dimensional objects, said system comprising:

a controller means;

a material dispenser means for dispensing:

build material having a first modulus of elasticity;

container material having a second modulus of elasticity; and

support material having a third modulus of elasticity and being held in a container comprised of said container material.

60. A system for building three-dimensional objects, said system comprising:

a dispenser means for dispensing:

a build material;

a second material forming a support structure; and

said dispenser means constructing a support pillar to support an object comprised of said build material.

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