This Evil Puzzle will keep you busy for many many hours. Simply place the four puzzle pieces within the available space. There is an easy and a hard option.
This design is based on hairyfacedhoomans puzzle, where i adjusted some things:
Use OpenSCAD to change the magnet size and text!
Just put the .scad and the “evil_puzzle_-_no_magnets.stl” file in a folder. Then start OpenSCAD.
Text customization:
Change the variables: text1=" Dear Friend,";
Recessed magnets:
Make a material change at layer 29, at 5,8mm (when you print with .2mm layer height):
When the printer stops, put in the magnets and fix them with a drop of superglue.
With the two layers the magnets are barely visible:
The author remixed this model.