Custom Filter for GOST 8762-75

This is a filter for masks with GOST 8762-75 threads.

I printed a previous version, this one is re-designed to fix the problems I encountered and to be tested tomorrow. The picture is from the previous version.

Filter A has the usual GOST threads design.
Filter B has a big rim next to the small threads.

Notes:

The lid id intentionally bigger than the case because otherwise it can't be easily opened.

Fresh prints might be a little bit too tight, but if you used them a few times, they will loosen. I recommend to screw it in partially and to turn it back and forward until it turns easily, then screw it in a little bit more and repeat until it turns easily.

The mask: https://www.thingiverse.com/thing:4268612 (Use Filter B with that).

Thread files: https://www.thingiverse.com/thing:4260984

Design file: https://www.thingiverse.com/thing:4281073