Impossible prison cube
thingiverse
This straightforward part is originally engineered for a basic demonstration on a Computer Numerical Control (CNC) Mill to quickly carve out a cube with a moving component trapped inside, featuring only one circular cut on each cube face. However, it can also be easily 3D printed using some material supports. Conceived from memories of my mechanical engineering studies 16 years ago, where the g-code for this design was preloaded in the classroom's industrial CNC Mill. It should scale to any size without any problems.
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