I printed this put with a 50 percent infill, took a while but parts are nice and sturdy. I will say the gears seem like they could use a slight redesign because they get tight and then loose as you rotate them around. Still works though!
Hey, I don't know if this might work, but try flipping one of the gears over and reassembling it. The original designer made it so that each side is slightly different and there is an orientation to make it smoother.
That totally worked! Thank you for the tip!