4-Piece 3D Puzzle

prusaprinters

With only four pieces, this 3D puzzle is simple enough for young children. That being said, my 4-year-old still has trouble with it. This being the “sharpest” of the regular polyhedra, the corners are slightly rounded.The tetrahedron.stl file has all four pieces in their solved positions. To print, you'll need to “Split to Objects” and then place them face down in the correct orientation (they are NOT reversible). This is done for you already in tetrahedron.3mf (make sure to select your own printer and filament, though). I printed this on the Prusa Mini+ in PLA.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, 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 individual pieces are somewhat loose.The gcode and 3mf files were made using the following settings, which worked well for me:Prusa Mini+Prusament PLA0.2 mm layer heightNo supports15% infillXY Size Compensation = -0.05 mmElephant foot compensation = 0.3 mm