We took a Sherline vertical mill and removed the control wheels from the leadscrews. From there I designed and fabricated wooden mounts for NEMA 23 stepper motors. I then attached said stepper motors and "Home" limit switches while my coworker flashed an arduino microcontroller with a slightly customized Marlin firmware. After that, we calibrated the steps/mm in the Marlin firmware and went on to first test cuts. Everything looked good except for the Y axis stepper direction so I had to move that Home switch. With everything looking alright we started cutting. I'm back at the home office today working on different designs and reworking older ones to fit with new changes. Everything is proceeding roughly as planned. I think I've finally learned to stop predicting ideal timelines and to start pushing for 1 or 2 week long goals. I guess that's the nature of prototyping. I should be printing some more with PETG later this week to test dimensional accuracy. PLA prints need a scale up of ~101% on average and PETG is supposed to be more impact resistant and less prone to shrinkage than PLA so I'm interested to see where that leads. Will, hopefully, make testing of clearances a bit more handy and useful. If not, I'm not against moving to an SLA setup for better accuracy.