We noticed on the Rev 3 board that the stepper motor is getting quite a bit hotter than it was on the original. I checked the current going through it and used the potentiometer to limit it to 0.30 A (idle) (rated for 0.42A), and it still gets pretty hot while running the titration program.
I noticed the Arduino program doesn't disable the steppers from the start, so i added that to the file and reflashed it. Now they'll only turn on while it's stepping and that seems to address that problem quite well.
Problem is, the PCB isn't set up for that, as the E̅N̅A̅B̅L̅E̅ pin is currently attached to Arduino_GND. For the time being, the stepper driver has been suspended up with a bunch of jumpers with the E̅N̅A̅B̅L̅E̅ pin attached to the Arduino D2 pin. (See image below, green jumper going from arduino goes to E̅N̅A̅B̅L̅E̅ pin)
KonradMcClure
commented
3 years ago 
We noticed on the Rev 3 board that the stepper motor is getting quite a bit hotter than it was on the original. I checked the current going through it and used the potentiometer to limit it to 0.30 A (idle) (rated for 0.42A), and it still gets pretty hot while running the titration program.
I noticed the Arduino program doesn't disable the steppers from the start, so i added that to the file and reflashed it. Now they'll only turn on while it's stepping and that seems to address that problem quite well.
Problem is, the PCB isn't set up for that, as the E̅N̅A̅B̅L̅E̅ pin is currently attached to Arduino_GND. For the time being, the stepper driver has been suspended up with a bunch of jumpers with the E̅N̅A̅B̅L̅E̅ pin attached to the Arduino D2 pin. (See image below, green jumper going from arduino goes to E̅N̅A̅B̅L̅E̅ pin)