This is a filtered funnel for printer resin. It uses one part of the strainer below and simply clips together to create a solid and capacious filtered funnel which can then be disassembled for easy cleaning.
This comes as a pack of two which split apart, effectively providing four separate filters!
UPDATE (07/10/18): I have realised that I posted a version of the bottom with a wider diameter which doesn't fit common resin bottles. So, I have now added a narrower (27mm) version which does. It will still fit the same top, so you'll only need a new bottom - or keep both and show off to your friends!
Probably best printed in PETG for resistance to IPA I think, although PLA may be fine too.
PS, I assume it's obvious but print each element with the wider opening downwards.