MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
Works perfectly with stock parts, I've also used smaller motor (you can use any from the x,y,z axis) so there is no need for x spacer
you can also just order another smaller motor, even super thin like https://aliexpress.com/item/32841621498.html?spm=a2g0s.9042322.214.171.124b364c4dI7Duzw (but that one has less torque so for stock setup you would need to run it crazy high vrefs - tested)
if you want to use existing non-extruder motor (if you don't have spare one or don't want to order one) the simplest is the replace it with the x-axis motor
if you take it from the y you will need to offset the axis endstop as otherwise motor will hit the bed - https://www.thingiverse.com/thing:3398302
if you take it from the z, then you will need to use t-nuts, or drill new holes to mount taller extruder motor or use a holder like https://www.thingiverse.com/thing:3370669