I was talking about 3d printed gears. I was not talking about gearboxes, those have their own slew of problems as well. Like some ridiculous gear ratios in the 5:1 to 40:1 range which in my book is way to high. One thing about planetary gearboxes is that they are durable as heck but not really very willing to change direction. As for gt2 pulleys being crappy. They do not matter much as the belt tension compensates for it fairly well.
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