Print in Place Impossible Screw Mechanism

This is a screw toy that can be print in place as an assembly with mobile nut and screw. I call it “impossible” because the nut cannot be removed from the screw (without breaking it), and can only be assembled by 3d printing.

This is meant to be a demonstration toy of how 3d printers can be used to build an assembly with moving parts.

The assembly may need some breaking in before the parts move smoothly. I tried to make the clearance large enough so the parts will not fuse together while printing, but not too large so the assembly still performs like a screw and nut pair.

The longer version is designed so it will fit in 140 mm print space.