A hollow sphere printed in two pieces. I've been printing it in PLA with supports and the "legs down" and have not had trouble. It fits snugly and does not seem like it will fall apart even after use. It did take playing with it for a while until it was easy to open and close.
SphereA.scad | 155.0B | |
SphereA.stl | 335.9KB | |
SphereB.scad | 245.0B | |
SphereB.stl | 298.4KB |