Sixi Robot Arm mk2

The shoulder gearbox used to have plastic teeth. the interior gears would touch these teeth to deliver movement. This new design replaces those teeth with holes where 3x24mm steel dowel pins will fit. This means better power transmission, longer life, and greater accuracy.

Only the altered parts are included in this remix. The rest of the files are in the original. Print settings have not changed.

Note that the version number on each part has changed and now ends in "-2".

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