I have designed something to support the resin filter :
Looks good. I use a larger plastic cup so the filter sits in that one with no issues. Do have to fold it out so it sits close to round.
Interesting what filter are you using?
Just ones I buy at Menards. Fine mesh paint filters.
I bought a few funnels(the ones used to top up engine oil). These filters fit perfectly in them and I can stick the funnel inside the cartridge or bottle.