Part processing

1. A method, comprising:

receiving, by a computer system, a three dimensional (3D) definition of a build piece, the 3D definition defining a plurality of connected internal cavity sections;

generating, by the computer system, based on the 3D definition, a processing plan that comprises a plurality of instructions by:

generating at least one path within the connected internal cavity sections as defined by the 3D definition;

generating the instructions to move a magnet relative to the build piece based on the at least one path;

loading at least one magnetic medium into a cavity of the build piece, the build piece created by an additive manufacturing process based on the 3D definition;

moving, by a robot operating according to the instructions in the processing plan, a magnet relative to the build piece to magnetically move the magnetic medium in the cavity; and

after magnetically moving the magnetic medium in the cavity of the build piece, subjecting the build piece to a quality control test, based on the 3D definition, that uses a different magnetic medium by:

generating testing-instructions to move the different magnetic medium relative to the build piece based on the at least one path; and

robotically moving the different magnetic medium relative to the build piece using the testing-instructions.

2. The method of claim 1 , wherein the magnetic medium comprises a material capable of being attracted by a magnet.

3. The method of claim 1 , wherein the magnetic medium comprises iron.

4. The method of claim 1 , wherein the magnetic medium is attracted to a magnet.

5. The method of claim 1 , wherein the magnetic medium comprises magnetite.

6. The method of claim 1 , wherein the magnetic medium comprising an abrasive surface.

7. The method of claim 1 , wherein the magnetic medium comprises a magnetic core and a non-magnetic envelope.

8. The method of claim 7 , wherein the non-magnetic envelope has an abrasive coating.

9. The method of claim 1 , wherein magnetically moving the magnetic medium in the cavity comprises pulsing an electromagnet.

10. The method of claim 1 , wherein the cavity has a cavity surface; and

magnetically moving the magnetic medium in the cavity polishes the cavity surface.

11. The method of claim 1 , wherein the build piece has a support structure in the cavity; and

wherein magnetically moving the magnetic medium in the cavity removes the support structure from the build piece.

12. The method of claim 1 , wherein the additive manufacturing process results in a build material in the cavity; and

wherein magnetically moving the magnetic medium in the cavity removes the build material from the cavity.