I needed a little more print area for a RailCore and created a couple of modifications.

First, the fan on a Revo nozzle can be turned almost 90 degrees where the fan blows almost parallel to the Y axis. It doesn't quite make it to 90 degrees as it hits the Y homing switch. Thus the Tall Y end stop switch mount included here will allow the fan to turn fully 90 degrees. To insure the fan doesn't randomly turn away from the desired location, I used a tie wrap to hold it in place. It turns out that my Tongue fan duct is tilting a little, so a tie wrap was used to pull it vertical. A new mount will be installed soon that should get maybe 5 more mm.

Second, an X end stop mount was designed that used the nuts already in the top of the extrusion and goes over the top of the pulley mounts. A simpler mount could be designed if there were nuts in the bottom side of the extrusion but I didn't care to remove the corner blocks to add nuts and risk screwing up the rail location.

Finally, the PEI sheet was moved to the left about 10mm. This leaves a blank spot on the right hand side but the nozzle can't reach there. This give a printable area of 331mm in X. This also required grinding the lock nuts for the kinematic balls.

The Fusion models are included so the design can be changed to suit other situations.

RailCore

Doesn't Matter

Doesn't Matter

.4mm

100%

I used more infill than maybe needed but a couple of the X end stop mounts broke in testing.