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Guys, it is not only backlash that is a problem (and it is not too bad per se, because it could be taken care of in the software)
Gears (straight type) have significant periodic error as well.
This is why I am planning to do similar modification.
Ideally, the gears should be helicoidal.. however they are very expensive and small parts doesn't have them (not in required sizes, that is).
For direct drive we need steppers with 1000+ steps per revolution... again very expensive.
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