Mask Case FFP w/ optional Magnetic Clasp and Filament Hinge.

thingiverse

This is a magnetic clasping mask case that is remixed to let you use a short length of standard 1.75mm filament as a hinge. Requires a soldering iron/clothes iron/lighter + metal bed scraper or some other tool and heat source to melt the ends to form a cap. Uses 4mmx2mm Magnets but will work without it. There is a deepened one that is taller if you want to put more in it and one with more clearance if you can't insert filament into the regular one. Print it twice and stick them together, cut a piece of 1.75mm filament to fit into the hinge and melt the ends so it doesn't fall out.