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UM2 Belt Tension

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I noticed that the belt tension (short belts and long belts) differ for the x and y axis. Not by very much but still. How can I adjust it? I know how to do it on the UM1 but for the UM2, at least the long belts have a belt tensioner built in right? Is this thing "user serviceable" or does it operate automatically? I didn't want to pry it appart because I don't know how it works internally.

And for the short belts, can I follow the procedure from the UM1?



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