Method of making a physical object by additive manufacturing

1. A method of making a physical object by additive manufacturing, the method comprising:

providing a hardenable primary material, wherein the hardenable primary material is liquid or pasty;

building up the object by successively hardening layers of the hardenable primary material; and

cleaning the object from excess material by moving the object and thereby generating a mass inertial force in the excess material,

wherein the excess material is formed by at least one of the hardenable primary material and a hardenable secondary material;

wherein the moving of the object is a rotation of the object; and

wherein the rotation is performed about at least a first rotation axis and a second rotation axis, wherein the first rotation axis and the second rotation axis have different orientations.

2. The method of claim 1 , wherein the hardenable secondary material is different from the hardenable primary material.

3. The method of claim 1 , wherein the hardenable primary material is a photopolymerizable resin and wherein the hardening is performed by irradiation of the hardenable primary material by light.

4. The method of claim 3 , wherein the hardenable primary material is based on a formulation comprising camphorquinone as a photoinitiator.

5. The method of claim 1 , wherein the mass inertial force corresponds to a G-force of at least 100 G.

6. The method of claim 1 , wherein the object comprises a workpiece for providing a dental restauration from the object.

7. The method of claim 6 , wherein the object further comprises a fixture portion that does not form part of the dental restoration, wherein the fixture portion is configured for retaining the object in a post-processing device for cleaning the object from excess material.

8. The method of claim 1 , further comprising positioning the object in a motor driven post-processing device for cleaning the object.

9. The method of claim 6 , further comprising placing the object in a tray that comprises a receptacle for receiving the object, placing the tray in a centrifuge and centrifuging the object within the tray by the centrifuge.

10. The method of claim 1 , wherein moving the object comprises rotating the object at a rotational speed that is selected based on the rheological behavior of the hardenable primary material and the size of the object.