A fun puzzle to show your friends!

Here are the settings I used:

15% infill

Grid Infill

Anything else set to default

No supports are needed

Place both parts on the print bed, or print one at a time, depending on what you want, and have the flat surface to the bed, and the angled cuts to the top of the printer. After printing, be careful with assembly, the edges may be sharp, sand down if you would like. To assemble, line up the two pieces so that the thick diagonal lines up with the hollow diagonal in the center of both halves, and slide together. At first it may be tough to slide them together, because of exact tolerances, but after a bit of sliding back and forth they'll wear down until they can smoothly slide in an out. Then have fun giving it to your friends watching them struggle to open it! WARNING! THE CORNERS MAY BE SHARP. WHEN OPENING AND CLOSING, BE CARFEUL WHERE YOU PUT YOUR HANDS OR YOU MAY BE ACCIDENTLY CUT!