Prusa MK2 Haribo 3030 Y Belt Tensioner
thingiverse
Adjustable Y Belt Tensioner for Prusa MK2 Haribo 3030 Edition: Works with Other 3030 Setups Too. This adjustable Y belt tensioner is specifically designed for the Prusa MK2 Haribo 3030 edition, but it should also work perfectly well with other 3030 setups. It uses an M2 screw paired with an M3 square nut that comes standard in Prusa kits. The original design of this tensioner can be found on Github, so I'm not sure who to credit for the initial creation. To add custom supports in the space where the square nut will sit, I use S3D. You might also want to try printing without supports and see how it turns out.
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