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Customized filter remover tool, OPENSCAD source appended. About 60 minutes spent on creation. Similar stuff costs 300 rubles+. $fn=48; //filter diameter dia=64; //filter remover wall depth wall=3; //grain count grany=14; //cap height hgt=25; keyhgt1=5; keyhgt=10; keysqr=1/2*2.54*10*1.05; keygrans=6; //difference(){ difference(){ union(){ //base translate([0,0,hgt/2]) { difference(){ union