Rectangular or cylindrical box + lid (screw / hinged / snap / slide). Adjustable size. STL export for Bambu Lab.
Each checked wall gets its own opening sliced from the top rim; vertical rails inside hold a plate you can slide out and back in.
Import both STLs into Bambu Studio — they're already flat on the bed and print without supports. Press inserts in with a soldering iron at ~230 °C.