depending on your nozzle size your wall count will have to vary. With the standard nozzle of 0.4mm a wall count of 10 will give you a rather thick 4mm wall! I have been using 2mm walls with threads up to G4 (1/4 inch BSP 10mm hole) with no trouble larger than that use the modeled feature in Fusion 360 even if you have to case it afterwards. We use this system for nylon pressure vessel caps up to 6 Bar