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I also thought once of replacing the belts on my UMO with ball screws. There are 3D printers which have ball screws for all three axis. But: Unless you really need the very last few microns of x/y-accuracy you will not see a difference, especially not on the UM2. With the belts there are actually a few issues which can be avoided by general maintenance. If you have a belt rubbing at the pulley, you might want to print your own spacers between pulley and bearing with a slightly different length. From time to time it's good to check the tension of the short belts and to adjust it a bit if necessary. I also read some UM2 users had an issue with the auto-tensioner of the long belts and they had to replace it after some time. Personally, I don't see such an effect (yet) on my 1.5 year old UM2.

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