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the question is the bore geometry and, as mentioned, the nubs for the encoder. Anyone with access to a lathe and bridgeport could easily modify off-the-shelf gears to make an aluminum set. If done in reasonable volumes, the cost difference should be reasonable compared to paying a commercial additive manufacturing company to make them. That being said, the original plastic gears lasted pretty damn long. A 3D print with a well selected material could be adequately durable.
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