In case someone might be interested:
I used the MGN9C series rail/block for the Y axis to replace the center mounting rollers. I printed the bearing block spacers to about 18mm high in order to keep the printer bed’s original height and belt track spacing. Other than that, I added the 3mm steel plate to finish the mod.
Maybe my 3mm steel plate was not completely flat, but I did have to play with shim thickness on the printed bearing block spacers to keep the rail motion smooth. I have no way to mill the plate and might consider an aluminum plate if I was to do it again.
The bed leveling nuts take a bit of a balancing act to get them started on the stud because of the linear rail’s location. I also replaced the bed leveling springs with silicon mounts.
Paul
