METHOD FOR 3D PRINTING

1 . A method for 3D-printing of a polymer composition containing a thermoplastic elastomer, by using a fused filament fabrication printer, characterized that the polymer composition contains 0.1-3 wt. % of a mold release agent and/or an external lubricant and optionally 0.5-10 wt. % of a matting agent and wherein the thermoplastic elastomer contains monomer units of dimerised fatty acids and/or a diamine derived there from.

2 . A method for 3D-printing according to claim 1 , wherein the polymer composition contains at least 0.1-3 wt. % of a mold release agent and/or an external lubricant.

3 . A method for 3D-printing according to claim 1 or 2 , wherein the polymer composition contains an acid amide.

4 . A method for 3D-printing according to any one of claims 1 - 2 , wherein the polymer composition contains eurecamide.

5 . A method for 3D-printing according to any one of claims 1 - 4 , wherein the polymer composition has a hardness of shore D<70.

6 . A method for 3D-printing according to any one of claims 1 - 4 , wherein the polymer composition has a hardness of shore D<60.

7 . A method for 3D-printing according to any one of claims 1 - 4 , wherein the polymer composition has a hardness of shore D<50.

8 . A method for 3D-printing according to any one of the claims 1 - 7 , wherein the dimerized fatty acid contains from 32 up to 44 carbon atoms.

9 . A method for 3D-printing according to any one of the claims 1 - 8 , wherein the dimerized fatty acid contains 36 carbon atoms.

10 . A method for 3D-printing according to any one of the claims 1 - 9 , wherein the thermoplastic elastomer contains 40-80 wt. % of polybutylene terephthalate hard segments and between 20 and 60 wt. % of monomer units of dimerised fatty acid and/or a diamine derived therefrom.

11 . A filament for 3D-printing as defined any one of the preceding claims.

12 . A. system for feeding a filament to an apparatus for 3D-printing comprising the filament of claim 11 .