Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4689407.
Designed to compliment the Resin Vat Drip Stack Remix by DaakTwo (https://www.thingiverse.com/thing:3784926)
For the screen media, I took one of the funnel strainers that came with my Saturn, and dunked it in denatured alcohol (isopropyl alcohol may work as well). This caused the adhesive to soften and release the screen from the paper. You can then cut this rectangular screen in half, giving you two ~30mm squares of filtering media.
Hold one square of screen in place on the funnel, then snap the retaining ring down on top. This holds the screen in place quite securely.
This funnel should be reusable an indefinite number of times assuming you rinse out the resin debris after each use. I suspect this sieve would also work fairly well for filtering out larger debris in your alcohol bath.
Update 2/3/21: Added an FDM version that doesn't have the built-in resin venting arches next to the build plate.
This object was made in Tinkercad. Edit it online https://www.tinkercad.com/things/83jBCneqFAv