Method of layerwise building up an object and a 3D printing device for performing such a method

1. A method of layerwise building up an object from at least a first and a second light hardenable resin on a 3D printing device, the 3D printing device comprising a build platform on which the object can be built up, a light-transmissive carrier comprising a plurality of recesses and a light projector that is arranged for projecting a light-pattern through the carrier toward the build platform, the method comprising the steps of:

(a) partially building up the object and thereby providing an object-in-process;

(b) filling one of the plurality of recesses of the carrier with a first blank layer of the first light hardenable resin such that the first blank layer is flush with a surface of the carrier that surrounds the recess;

(c) positioning the first blank layer between the build platform and the light projector;

(d) advancing the build platform toward the carrier and thereby bringing the object-in-process into contact with the first blank layer;

(e) irradiating the first blank layer with a light pattern to cause portions that are irradiated by the pattern to harden and thereby supplementing the object-in-process by a hardened layer;

(f) retracting the build platform from the carrier and thereby separating the supplemented object-in-process from the carrier;

(g) filling a second of the plurality of recesses of the carrier with a second blank layer of the second light hardenable resin such that the second blank layer is flush with a surface of the carrier that surrounds the recess;

(h) positioning the second blank layer between the build platform and the light projector;

(i) advancing the build platform toward the carrier and thereby bringing the object-in-process into contact with the second blank layer;

(j) irradiating the second blank layer with a light pattern to cause portions that are irradiated by the pattern to harden and thereby supplementing the object-in-process by a further hardened layer; and

(k) retracting the build platform from the carrier and thereby separating the supplemented object-in-process from the carrier.

2. The method of claim 1 , wherein the steps (b) and (g) are performed timely overlapping.

3. The method of claim 2 , wherein the steps (c)-(f) are performed prior to steps (h)-(k).

4. The method of claim 1 , wherein in steps (d) and (i) the object-in-process is positioned relative to the carrier so that a distance between the object-in-process and the carrier is provided, wherein the first and second blank layer each have a thickness that corresponds to the distance.

5. The method of claim 1 further comprising the steps of providing the carrier from an infeed reel and discharging the carrier onto a discharge reel.

6. The method of claim 1 , wherein a residual portion of the first blank layer is formed as a result of separating the supplemented object-in-process from the carrier, wherein the method further comprises the steps of irradiating the residual portion of the first blank layer with light to cause that residual portion to harden; and disposing the hardened residual portion of the first blank layer.