Pyraminx

This example is printed in ABS, acetone vaporized. PLA should work.
FDM print: split parts are recommended. It needs some precision at inner side.
sandpaper the tracks for no plastic blobs.
Insert a M3 nylock nut in the core, normal M3 screws required, no springs.
Lubrificate with vaseline. Puzzle runs good.

twin projects:
https://www.thingiverse.com/thing:3243865
https://www.thingiverse.com/thing:2748971
https://www.thingiverse.com/thing:2752158
https://www.thingiverse.com/thing:2749991
https://www.thingiverse.com/thing:2748069