CoreXY Z Axis Carriage for Delrin nut (4 hole, 8mm lead screw)

This is a Z Axis carriage modified to take a Delrin nut, for use with an 8mm lead screw.
I love starrysky's design, but I wanted to have 2 z-axis lead screws instead of just 1 5mm threaded rod .
I had to extrude out one of the faces so that it presents a flat surface that will connect to part 2040.stl.

I added M3 screw holes on both the top and the bottom so you can choose to put the nut on top (pull) or on the bottom (push).