foehnsturm 970
Besides extra torque I would like to know if there is any difference in accuracy and ringing . Theoretically, there should be an advantage, as with the standard setup the part of the belt which pulls the head in one direction is three times as long as the part that pulls in the opposite direction.
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Daid 306
Then you better not do this IMHO.
The Printrbot uses 2 motors on 2 different Z axiz, and that already gives some issues. They are controlled with a single driver and split motor cables.
The pololus are rated 2A max, but that's with more cooling then you have. 1.5A is about the max where they will shut down. The default is around 1.1A/1.2A for the UM. So you do not have a lot of extra power there.
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