I made this as a simple test for a 19mm-cubie 1x2x2 design, intended for use in future projects. It can hardly be considered a puzzle, since it has something like 3-4 possible positions. The heart extensions were designed and printed after being inspired by the transparent red filament used to print the base "puzzle".
Like many of my designs, this "puzzle" is designed to be assembled without hardware. However, I haven't gotten my peg design quite right yet, so the rim of the peg needs to be trimmed down a bit with some wire cutters in order to fit in the hole. It turns alright straight off the printer, but a little spritz of silicon lube does wonders.
As it is, this is more of a cute fidget toy than a proper twisty puzzle. If I could size it down some more, it would make a nice keychain or bag charm for any twisty puzzle enthusiast.
Anchor.stl and Ball.stl should be printed at slightly higher infill, because 3D printers sometimes have trouble dealing with spheres. If you are using a perforated bed (standard on the Up Mini 2) rafts are recommended to avoid a bumpy bottom texture.
At this moment, the rim of the peg needs to be trimmed down with a knife/cutter until it can fit into the hole. I will probably fix this design flaw in the future, though it is not a top priority.
Jamming a folded strip of paper into the notch of the peg helps it stay in a lot tighter. Recommended to prevent popping.