Y belt tensioner for 2020 and 2040 aluminum extrusion
thingiverse
Belt tensioner for Y Axis. You'll also need: 2 ball bearings for the idler, 1 M4 screw (I used 60mm), 1 M3 screw for the idler, 2x M4 Insert nuts for wheel and idler because hex nuts are inferior, various washers, nuts etc for securing it to the extrusion. The Stepper holders are modified versions of Prusa and Haribo Mod designs. You'll need to drill a hole in your extrusion for the M4. Added a version for 2020 but it's untested.
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