Made this because in my area the roll of patches are 79mm in diameter, with an inside diameter of 25.5 mm. They usually have 1,000 patches on the roll. Also did not like the other designs where the tangs would break off. 1/4 inch turn and it locks in place. Used PLA with 60% infill. I like it to be on the higher infill side for toughness. You may have to lightly file the knobs on the cap. Also there is a seam down the side of the cap that needs to come off, unless you can get rid of it in your print settings. I color corradiated Brown for Brown patches ect,ect...