X Carriage for Igus Pillow Block Bearings with Rear Fan Mount

Inspired by the Pillow Block X-Carriage by AlephObjects - this is an X-carriage designed to be used with Igus Pillow Block Bearings, with room for an extruder fan mount on the rear of the carriage.

I specifically use this X carriage on MendelMax 1.5 printers.