Just finished printing this on my Ender 3. The Base took like 38 hours as per suggested settings, 0.15mm layer height, 50mm/s, 25% infill. I've tweaked my Cura setting and can probably get it in about 20 hours, 0.20mm layer height, 60mm/s, 20% infill. The rest of the parts took about 2 hours total. However it's done, it looks great and works fantastic! Got the 3/8" dia. bearings from a slingshot ammo kit from Canadian Tire (in Canada). 75 balls for $6.49!