These are some dividers for old Brumberger 35mm film slide boxes so they can be used as part storage. The holes use 6x2mm magnets. I included the step files. Feel free to edit.

square divider: 51.25 x 52.5 mm

magnetic rib divider: 186.5 x 8.1 mm

added some 90mm containers

any

10%

Print magnet hole side up.

I cleaned the holes with a 5.9mm drill bit after printing. This allowed me to press in the 6x2mm magnets.