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I decided recently it would be too much of a pain to sand the valves, so I scaled down the X and Z axes of the file down to 19mm instead of 19.80mm (before I rotated the print so it points upward for convienence purposes.) This has proved effective and I have a staggaringly less amount of sanding to do on the parts. I also scaled down the valve keys by about .6mm on the shorter sides to compensate for this valve adjustment.