Prusa-I3 x-belt tensioner/idler
thingiverse
A belt-tensioner/idler combination is available for the I3 Rework variant, which can be fitted inside the right section of the x-axis assembly. This allows for a retrofit of the existing x-assembly with tensioner functionality. The installation requires two M4 x 20mm screws, nuts, and washers, along with a 624ZZ bearing. The bearing and screw set are reused from the old idler during upgrades. You can print either part_a + part_b or the with_support version. Check it out at http://www.thingiverse.com/thing:119616.
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