This box is meant to hold 100 sleeved MTG cards (give or take a few) along with a commander in front inside of a top loader sleeve. I also included holes on the sides of the container for magnets (total of 4, 1.66mm thick, 11.95mm diameter) that can be press fit. Holes can be adjusted easily using meshmixer, or I'd be happy to provide the STEP files upon request if you'd like to adjust it in CAD.
Edit: The magnets are measured to be slightly smaller than advertised, but nominally they are 12x2mm (https://www.amazon.com/dp/B07GX7Z4DF/ref=cm_sw_r_apan_glt_i_76C6KBDT2KZJ24RTG00T?_encoding=UTF8&psc=1)
Happy printing!