8-Piece 3D Puzzle

This 3D puzzle forms an octahedron when solved. It's a medium balance between challenging and fun.

Printing

The octahedron.stl file contains all 8 pieces in their solved positions. To print, you will need to “Split to objects” and then arrange them with the correct faces down--they are NOT reversible. This is already done for you in the octahedron.3mf file (make sure to select your own printer and filament, though). I printed this on the Prusa Mini+ in PLA. You can just fit all 8 pieces on the Mini if you arrange them as in the 3mf file.

You may need to experiment to get the pieces to fit together well.  Depending on your particular printer and filament, you may need to use XY Size Compensation (in the Expert settings on PrusaSlicer) to achieve a good fit between the pieces. Increasing the elephant foot compensation won't hurt either, in order to make sure there's no additional interference caused by elephant foot.

Begin by printing just two of the pieces. They should fit together without needing to apply much force. If they fit too tightly, decrease the XY Size Compensation. If they are too loose, increase the XY Size Compensation. Once the entire puzzle is assembled, the pieces should be pretty stable without falling apart, even if two pieces alone are somewhat loose.

The gcode and 3mf files were made using the following settings, which worked well for me:

• Prusa Mini+
• Prusament PLA
• 0.2 mm layer height
• No supports
• 15% infill
• XY Size Compensation = -0.05 mm
• Elephant foot compensation = 0.3 mm