Printed in PLA and PVA on an Ultimaker 3 Extended at .1mm vertical resolution, 100% infill. After printing, place the assembly in a water bath. After a few hours (depending on the water temperature, agitation, etc.), remove the assembly and carefully attempt to rotate the gears. If they do not rotate, return the assembly to the water bath for another few hours then try again. If they do rotate, rotate the gears enough to expose the PVA trapped between the gears, the return to the water bath. Repeat until all PVA is removed. Also, changing the water frequently will assist in expediting the PVA dissolve process. Finally, I posted a video showing the water bath I used; a printed circuit board etching tank with an air agitator and heater. The agitator generates bubbles that better penetrate the tight areas between the gears, supports, etc., that assist in dissolving the PVA. I run the tank heater at 28 degrees celsius (approximately 82.4 degrees centigrade) which also assists in dissolving the PVA.