I wanted to extend the classic 3-piece burr puzzle to look like an Easter egg. It does work, but there isn't a lot of space inside. I'll have to think of a redesign with more space.
The OpenSCAD code was generated with rust code using the flowscad library.
Printing:
You will need to separate the pieces in your slicer, but I put them all together so you can see how they fit.
One of the pieces requires support, but the two larger pieces can print fine if your printer does overhangs well.
The author marked this model as their own original creation.