Tetra Puzzle

This is my attempt at a tetrahedral puzzle. Disclaimer: I am not a puzzle designer, I just thought this would be a good design challenge over the holidays!

Note that the tolerances on this make the final assembly quite tight - see Post Processing - so when you get to that stage of solving, gently press the parts together to close up the gaps.

Similarly, when disassembling, I find wiggling adjacent Tetras while gently pulling apart helps greatly.

The puzzle will loosen with use.

PS. You need 4 of these for a complete puzzle!