Parts to make an MF8 3x4x5 cuboid puzzle fully functional.

thingiverse

These are the parts you'll need to bring an MF8 3x4x5 cuboid puzzle completely to life. Although it's called that, the standard version really isn't due to problems with the internal central layer that need fixing. You only need to print three of each part. I made extra for testing purposes and they seem to be working great in my puzzle. However, differences in printer tolerances or accuracy might not give you the same results. To fix your puzzle, partially disassemble it and replace all of the large internal edges except for the one with the hook piece on it with a pair of these parts. Then reassemble it and enjoy solving.