Designed by Dai Nagata, Arrow Case won the first prize of IPP 21 in 2001. The puzzle contains 2 packing trays and 4 identical arrow pieces. The goal is to fit all 4 pieces into each tray.

buy online: https://witful.net/Order.html (owned by the designer)

Modeling using FreeCAD, the source file is also uploaded. You can easily modify it and export the .stl file.

Modeling non-rectangular 2D packing puzzles could be tricky, normally it requires some testing. But the designer generously uploaded the design details on his site: https://witful.net/ArrowCase.html . Everyone could print the puzzle on a piece of paper and glue it on cardboard to play. I’m just making a 3d version so you don’t need to do the handwork. The size I choose for convenience is 10 pixel = 1mm, so it might be a little small. Resize it if necessary. The square tray is a little loose, but it doesn’t seem to introduce any unintended solution. I also uploaded a tighter version (not tested).