A method of applying a two-component polyurethane composition by means of 3D printing, comprising the steps of - providing a pumpable first component A comprising at least one polyol A1 having an OH functionality in the range from 1.5 to 4 and an average molecular weight (number average) M n in the range from 250 to 15 000 g/mol, and preferably at least one diol A2 having two hydroxyl groups joined via a C2 to C9 carbon chain, and at least one compound T having at least one thiol group; - feeding the first component A, especially by means of a pump, to a continuous mixer comprising • an inlet, • a mixing region having at least one static or dynamic mixing element connected to the inlet, • an outlet into which the mixing region opens, wherein the first component A is conveyed through the at least one inlet into the mixing region; - feeding a pumpable second component B into the mixing region of the continuous mixer, where the second component B comprises at least one polyisocyanate I; - mixing the first component A with the second component B in the mixing region of the continuous mixer to give a mixed curable polyurethane composition; - conveying the mixed curable polyurethane composition to the outlet; and - applying the mixed curable polyurethane composition layer by layer, especially by means of a moving printhead; wherein one of the two components A and B additionally includes at least one metal catalyst K for the reaction of hydroxyl groups and isocyanate groups that is able to form thio complexes, and the molar ratio of all the thiol groups in the at least one compound T to all metal atoms in the at least one metal catalyst K is between 1:1 and 250:1. - providing a pumpable first component A comprising at least one polyol A1 having an OH functionality in the range from 1.5 to 4 and an average molecular weight (number average) M n in the range from 250 to 15 000 g/mol, and preferably at least one diol A2 having two hydroxyl groups joined via a C2 to C9 carbon chain, and at least one compound T having at least one thiol group; preferably at least one diol A2 having two hydroxyl groups joined via a C2 to C9 carbon chain, and at least one compound T having at least one thiol group; - feeding the first component A, especially by means of a pump, to a continuous mixer comprising • an inlet, • a mixing region having at least one static or dynamic mixing element connected to the inlet, • an outlet into which the mixing region opens, wherein the first component A is conveyed through the at least one inlet into the mixing region; • an inlet, • a mixing region having at least one static or dynamic mixing element connected to the inlet, • an outlet into which the mixing region opens, - feeding a pumpable second component B into the mixing region of the continuous mixer, where the second component B comprises at least one polyisocyanate I; - mixing the first component A with the second component B in the mixing region of the continuous mixer to give a mixed curable polyurethane composition; - conveying the mixed curable polyurethane composition to the outlet; and - applying the mixed curable polyurethane composition layer by layer, especially by means of a moving printhead;