Z-Axis Camera

I have an Ender 3 Pro, and I initially printed a mount to put the camera in front of the printer (like pretty much everyone does). I had two problems as a result:

0) I couldn't really see much of the initial layers because my EZABL Pro was in the way

1) My first tall print was so tall that I couldn't monitor the print progress for that last 50mm of the print.

To eliminate the first problem, I figured I'd mount the camera BEHIND the printer. This had the added benefit of moving the camera out of the way when I was mucking around with the print surface (removing/cleaning the bed, or removing a printed item).

The second problem was solved by buying a 500mm 2040 extrusion and a dual z-stepper kit, and attaching them to the absolute rear of the right-side 4040 extrusion base (see pictures above). This had the added benefit of keeping added weight off the X gantry.

I wanted to avoid the use of the typical delrin trolley wheels, so I used a 450mm MGN12 linear rail.

The pr