This is a 2 piece box to house earplugs. I designed these around Etymotic earplugs, but I'm sure many others will fit.

Also needs 2 6x3mm magnets. The whole is very snug, I used a soldering iron with a flat tip at 180 degrees C to slowly push the magnets into place.

Printed with PLA, 20% infill, 0.15 layer height