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I've uploaded the latest files now. The 1st, 2nd and 3rd valve slides are modeled with sleeve pipes at this version. The pipes can either be printed (can be problematic due their wall thickness is 0.5mm) or used as plastic-brass pipes cut to the same dimensions. Using pipes with a stronger material can enable them slide more easily. I think %100 solid should work for not creating unwanted vibrations or not, we can not be sure without printing. All untested :D. The working of the valves would definitely be problematic as well. The touching edges will need to be processed somehow. The valves can be oiled by graphite dust maybe? Dont know if normal oil can melt the plastic someway or not.