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i changed the variable "mountPlate" and uploaded the file (MyExtruder_NoMount.stl) for you.
Just split the file in your Slicer, if you want to print the idler separat.
Also, you can easily modify the extruder with openScad to your needs - try it, it's pretty simple :)

The used mount-thingi with the red one is a modified version from http://www.thingiverse.com/thing:1357814.

.. hope, you'll like it :)

Stepper mount for 2020 rail