No idea how much difference will it make, but its kinda popular mod for other printers so i made it for my mk4s too.
hw needed;
2-3x m3x25 din912 screw (same type as original, just 7mm longer)
1x 0.5mm shim (i used https://www.aliexpress.com/item/1005009420795456.html?spm=a2g0o.order_detail.order_detail_item.2.7141f19cA6Lg8J ) to be placed between bearing and pulley.
1x F695-2RS bearing (i used https://www.aliexpress.com/item/1005008467546575.html?spm=a2g0o.order_detail.order_detail_item.3.1327f19cHxRAoT )
i personally printed for mself “y-motor-holder-R3 - support bearing.stl”
idea of “y-motor-holder-R3 - support bearing _easy” is to be able to keep one screw on the motor during the instalation so it should be easier.
“y-motor-holder-R3 - whole part” is a whole part.
print with default settings for prusa parts.
The author remixed this model.
support bearing for Y motor