Prusa I3 MK3 Y axis Adjustable Belt Tensioner Frame
thingiverse
The original frame by MattyVee was a bit too narrow for my pulley, resulting in rubbing, especially when the pulley heated and expanded. Increased the space between the side by 1.5mm to allow for larger pulleys. Also increased the guide slots for the fork to 6mm. This allows using 6mm spacers to center the pulley. For my pulley, a pair of 6x6x3mm spacers (same as the Mk3 bed spacers) exactly centered the pulley and allowed for smooth motion.
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