Hello, i bought this resin along your alkaid printer and tried it out for the first time today_br__br_After my first print, when i tried to filter the used resin to throw away the bad part, i used a paper filtre (such as in coffee machine) and was suprised it blocked all the resin, which is annoying. _br__br_What kind of filter should i get to separate used and reusable resin ?