Parametric Z motor mount spacer for the Ender 2 / Ender 3

The Ender 2 (and Ender 3) Z-motor mount holds the motor about 1mm too short from the aluminium extrusion, causing the lead screw to be held at an angle, instead of it being parallel to the extrusion.

This causes the lead screw to bind, especially when the nozzle is close to the bed.

My Ender only needed a 1mm spacer, but with the Customizer, you can change this thickness to any value you need (up to 10mm).

You can also adjust the diameter of the bolt holes, should you find that the hol