Process for 3D printing

1. A process for extruding a 3-dimensional (3D) object, the process comprising:

a) providing a suspension comprising:

60-90% by weight of the total suspension (w/w) of at least one ceramic material;

at least 10% by weight of the total suspension (w/w) of one or more fatty acids or derivatives thereof; and

b) extruding the desired object using the suspension as a feedstock;

wherein said fatty acid derivatives comprises at least one acid group from the group consisting of carboxylic acid, phosphonic acid and sulfonic acid group attached to at least one C 5 -C 30 hydrocarbon.

2. The process according to claim 1 , wherein the ceramic material is selected from the group consisting of TCP (tricalciumphosphate), MCP (monocalciumphosphate), DCP (dicalciumphosphate), tetracalciumphosphate, hydroxylapatite, alpha-TCP, beta-TCP, titanium oxide (titania), aluminium oxide (alumina), zirconium oxide (zirconia), yttrium oxide (yttria), yttria stabilized zirconia, indium oxide, indium tin oxide, boron nitride, silicon carbide, boron carbide, tungsten carbide, beryllium oxide, zeolite, cerium oxide (ceria), tungsten disilicide, sodium silicide, platinum silicide, zirconium nitride, tungsten nitride, vanadium nitride, tantalum nitride, niobium nitride, silicon boride, clay, earth, soil, cement, portland cement, silica, barium titanate, lead zirconate titanium, zinc oxide, potassium niobate, lithium niobate, sodium tungstate, glass, geopolymers, sodium chloride, sodium nitrate, potassium nitrate, potassium chloride, magnesium chloride, calcium chloride, calcium nitrate, magnesium nitrate, strontium oxide, strontium phosphate, calcium sulfate, barium sulfate, calcium carbonate, sodium carbonate, sodium fluoride and mixtures thereof.

3. The process according to claim 1 , further comprising:

c) solidifying the extruded material by a method selected from the group consisting of sintering, hydrating, coating, melting, infiltrating and/or crosslinking the extruded material.

4. The process according to claim 1 , wherein the particle size of the one or more ceramic materials are in the range 1 nm-1 mm.

5. The process according to claim 1 , comprising in the range 70-90% of the at least one ceramic material, by weight of the total suspension (w/w).

6. The process according to claim 1 , wherein the one or more fatty acids are selected from the group consisting of caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, lignoceric acid, cerotic acid, myristoleic acid, palmitoleic acid, sapienic acid, oleic acid, elaidic acid, vaccenic acid, linoleic acid, linoelaidic acid, α-linolenic acid, arachidonic acid, eicosapentaenoic acid, erucic acid, and docosahexaenoic acid.

7. The process according to claim 1 , wherein the suspension comprises in the range 10-40% fatty acid by weight of the total suspension.

8. The process according to claim 1 , wherein the suspension comprises a mixture of 80-85% (w/w) ceramic material and 15-20% (w/w) free fatty acid.

9. The process according to claim 1 , wherein the ceramic material is biocompatible.

10. The process according to claim 1 , wherein the ceramic material is biodegradable.

11. The process according to claim 1 , wherein the object is a medical implant.

12. The process according to claim 1 , wherein the object is a bone implant.

13. The process according to claim 1 , wherein the object is a dental implant.

14. The process according to claim 1 , wherein the extruded mixture is an injectable or implantable medical void filler, cement, glue, bone cement or tissue glue.

15. The process according to claim 1 , wherein the extruded object forms a cement when the fatty acid leaves the mixture.

16. The process according to claim 1 , wherein the suspension comprises 80-90% biphasic TCP/hydroxylapatite and 10-20% of fatty acid that has a melting point above 37° C.

17. The process according to claim 1 , wherein the suspension comprises 80-90% of a stoichiometric powder mixture of TCP and MCP and 10-20% of fatty acid that has a melting point above 37° C.

18. The process according to claim 1 , wherein the suspension comprises 80-90% of a stoichiometric powder mixture of tetracalcium phosphate and dicalciumphosphate with 10-20% of fatty acid that has a melting point above 37° C.

19. The process according to claim 1 , wherein the suspension further comprises one or more drugs.

20. The process according to claim 1 , wherein the suspension comprises less than 1% by weight water.