Method for the post-treatment of printed 3D objects

A method of aftertreatment of 3-D objects (10) printed from a light-curing resin formulation, wherein a 3-D object (10) taken from a 3-D printer is aftertreated by the following steps:

• a) exposing a surface (11) of the 3-D object (10) to an aftertreatment fluid (16) comprising a light-curing resin formulation for a given contact time, where the aftertreatment fluid (16) and contact time are chosen such that the aftertreatment fluid (16) can penetrate into a fissure (12) or a pore (13) on the surface (11) of the 3-D object (10) within the contact time owing to capillarity;
• b) removing the aftertreatment fluid (16) remaining on the surface of the 3-D object (10);
• and
• c) irradiating the 3-D object (10) with light for post-curing of the light-curing resin formulation used to print the 3-D object (10) and curing the aftertreatment fluid (16) that has penetrated into fissures (12) and/or pores (13) at the surface (11) of the 3-D object (10);
• wherein the exposing of the surface (11) of 3-D object (10) to the aftertreatment fluid (16) comprises a coating of the surface (11) of the 3-D object (10) with aftertreatment fluid (16) or dipping it into an aftertreatment fluid bath;
• and
• wherein in the case of cleaning of the surface (11) of the 3-D object (10) with aftertreatment fluid (16), the aftertreatment fluid bath is configured as an ultrasound bath or has a stirrer system for washing the 3-D object (10) with aftertreatment fluid (16).