Flashforge Finder, finest setting, raft base to prevent problem with the first layer. The raft was easily removed and everything spun freely without any post processing. A quite big gap between the gears so sometime i will try to figure out how to shrink that in the model before printing. Used 10% infill and its surprisingly strong! Printed the 6 gear version. I'm newbie in fiddling with 3D creation software - is it easy to modify the center hole to any other dimension?