Gearbox v4 ideas

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• Make gearheads as short as possible (the current size is somewhat arbitrary and they are plenty strong anyway, 5mm gearhead height per stage should be attainable)
• Merge bottom cap and S1 Ring (4 less nuts and screws needed, as well as removes need for taper on S1 ring teeth)

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• Add slightly more distance between S2 Ring ceiling and planets to remove friction when under vertical load

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• Add ridges on the contact area between S2 Ring and bearing to better distribute glue

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• Make planets hollow (save weight and printing time, likely at no significant cost in terms of rigidity)

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• Reduce space wasted due to the bearing somehow? (not necessary but printing time reductions are welcome)

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• Reduce height of S2 Ring bearing outcrop

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• Add holes under bearing in S1 Ring to enable prying the whole bearing-S2 Ring assembly out with a tool (friction from all the gearheads might make this impossible but worth a try)

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• Outcropping 'cylinders' on S1 Ring with thermal inserts as attachment points

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• Reduce amount of output nuts to three? (saves weight cuz less screws and can also shrink S2 Ring volume a bit)

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~30% reduction in print time expected (~5 hours total)