Summary

This kit allows the use of a rail for the Y-axis on a Prusa.

Instructions

Print (2 of the clamps if you are doing individual prints, the last STL is a full set, the previous are individual parts)
Assemble
You'll need 10 m3s 10 to 16mm ea (4 for the motor, two for each clamp and two for the belt tie down)
2 m3 nuts
m3 washers as you wish.
One m5 20mm+ and washers for the idler
two 605zz bearings for the idler.
A Rail with carriage store.trinitylabs.com/linear-rail-and-car-for-y-axis/

If you decide to go with 608zz bearings for your idler instead, you'll want to bore the idler mount hole out a bit either before or after printing.

Prusa rail kit