I bought an NZXT S340 with a missing foot so measured the length, width, and height of one of the remaining feet and made this model. It doesn't look like the original but functions similarly. I printed it in basic black PLA but if you want to have the anti-slip effect of the original rubberised foot then try printing in a different material with that property. Very basic print using minimal filament and time. Will need some kind of adhesive (I used hot glue) to stick it onto the case.