Crazy Tetrahedron Puzzle (whole series)

thingiverse

This is a functional clone of Dayan/MF8 Crazy Tetrahedron series puzzle, boasting unique dimensions that set it apart from the original. As a result, parts are not interchangeable, but you can still configure any puzzle in the series to suit your preferences. There are three types of faces: * 0 - Inner pieces are fixed and do not rotate with face rotation; only outer pieces move. * 1 - Both inner and outer pieces move freely. * 2 - The entire face rotates, with no inner circle. The combination of different face types creates a variety of puzzles within the series. To select your desired puzzle, please refer to the configurations table. Unlike my previous crazy puzzle, which featured glued pieces of different colors (corners and edges), this design is disassemblable. You can reconfigure edge and corner pieces by attaching different configurations of subparts according to your selected configuration. Outer Edge pieces are assembled using short bamboo sticks with a diameter of 2.5mm. Corners parts are attached to triangle prism-shaped link pieces using a 5mm piece of toothpick. The tricky part lies in corners assembly, as parts must align without gaps. First, glue pairs of corner subparts (left and right). Then, faces that should align with other corner pieces should be sanded slightly, just enough to remove roughness. If your printer is calibrated correctly, you should get three pieces that fit together perfectly. For the core, I used a composite core idea similar to Crazy 3x3x3, but this time it was not as effective due to spherical parts having 60-degree inclined faces. However, even with these limitations, the core still performs well. I printed the puzzle without stickers, but a stickered version is also possible by printing everything in one color (preferably black). This time, I decided not to sand or polish the pieces, which saved me a significant amount of time. I only used sanding to remove obvious roughness. The puzzle requires four spring pieces and four M3x20 screws. The springs should be strong enough to prevent the puzzle from being too loose; Rubik's Cube springs and screws work well in this regard. I am pleased with how this puzzle turned out, as everything works smoothly, even the 0-faces. The puzzle is stable and does not explode easily. It can sometimes be a bit catchy, but this is to be expected given its complex design. To assemble the puzzle, follow these steps: * Print one pyramid part and four spherical ones. Remove support membranes using a drill. * Place M3 lock nuts in pyramid holes and glue sphere sectors. Once glued, use sanding paper to smooth out the sphere surface. * Assemble inner edges and corners by gluing corresponding parts with acetone (for ABS) or dichloroethane or superglue (for PLA). * Drill holes with a 2.5mm drill for outer Edge pieces and attach them using short bamboo sticks. * For outer Corners, glue pairs of corner subparts (left and right). Then, faces that should align with other corner pieces should be sanded slightly to remove roughness. * Print three hooks for each Center cap and glue them into the cap deepings. I designed this puzzle in Onshape, a powerful free CAD editor. You can find my document here: https://cad.onshape.com/documents/7bf10b3855ddb07ed4399e77/v/cc196a849b13baa5cb3cc968/e/758244a0bb6f414a0b73f365. Feel free to inspect the design, make tweaks, or even branch off and create your own variations.