Prusa i3 as router CNC - Y axis direct drive

This design is not from me. I adapted it from giulio prelli's. Congratulations, Giulio!
You can improve the accuracy of Y axis of your Prusa by using direct drive method.
As always, all the bearings are 608ZZ and rods 8mm. The frame is 6mm

Upgrade 22/01/2018:
I would want to remark that the thing is only for router CNC, *NOT* for 3DP. So, please think twice before make comments.
We do know that 3DP need high speed on X and Y axis. This is not the case.
This thing comes to replace the X a