I’m not sure if this gets lost along the way, but I just wanted to chime in and say that I did this mod but since I couldn’t wait for a leadscrew to arrive I have tried with a regular threaded rod instead.
I’m using the same printed parts just with an alternative mount for the nut
The only extra is 4 M3x12mm screws to fasten the M8 nut to the printed part. Works like a charm!
You need to change the pitch in GC to account for the different threading. It’s 1.25 for M8 rods and I’m pretty happy with the results!