Made an octahedron puzzle based on an old wooden puzzle I had lying around. All the parts are interlocked and the only way to take it apart is by rotating the lock piece. It's very easy to print and was created with calibration in mind. Took some photos as an assembly guide, the hardest part is putting the middle cross together the right way. Part list: 1 x 3_1_lock 13 x 3_1 6 x 5_1 4 x 5_2 4 x 7_1 2 x 7_2 2 x 9_1 1 x 9_2 33 parts total.