This is only a derivative of it's parent in spirit. It's a completely new openscad file.
I liked the idea of the parent but I felt that it would be nice to have a little bit more keeping the bearing X Stage perpendicular to the Y Rods. So, this is a spacer for the linear bearings that matches up with 3 of the screws that hold the X stage together.
Print it out.
There are a couple of version of the file. One with a bearing hole of 16mm, 16.1mm and 16.2mm
If the 16mm is too tight you can print out a larger one (you may want to start with the 16.1mm one)
To get the file for the back side, scale by -1 in replicatorg.
You may have to sand/file/cut the hole for the bearing a little bigger to get an easy fit (or adjust the openscad file)
You may also have to sand down the piece so it isn't quite as tall so that the snap rings can fit (or adjust the openscad file).
The height worked perfectly for me, the hole was a bit tight but I figured that was better than having a lot of slop in it.
2 SW06 bearings 4 snap rings of the appropriate size ( 5/8" I believe ).
Remove the X Stage from the bot.
Push out the stock bushings.
Install 1 snap ring on each bearing and press them in from the inside of the stage.
Push the printed pieces on from the outside and secure with the snap ring (but turn them perpendicular so that it doesn't hit the screw heads.
Remove the screws, being careful not to lose the nuts, rotate the piece and install slightly longer screws (20mm?) to attach it.
I removed the bottom screw & nut and then held the top nut in and removed the screw and then removed the other screw while holding the piece level so the nut didn't fall out and then replaced the screws and the other nut.
The openscad file generates the front piece only, I just flipped it by scaling it by -1 in replicatorg.