Ians Upgrades Gear SunI printed this whole gear box out with my ultimaker and found that the central sun was super super tight. so i reworked the gears to be 1mm saller, also i made the inside whole half a mm bigger, i think this could be down to colling and PLA expansion, but now it workds for me, hope it helps. Ianps. also cut away some of the fat on this model. so it prints now in 30 minutes at 100 speed.Ian :-)