That’s interesting. I hadn’t thought of using the other two slots for two more driver boards.
0.8V for one motor means you are running it at 1.6A, which is more than the rated current for my motors. What motors are you using?
What method were you using to measure the temperature? I’m interested in both the guage, and whatever you were doing to stress it. I’ve used a 60C hotbed to heat up a PLA print so I could mold it a little, are your motor mounts changing shape at that temp?
Very good info though. I would feel better if I could measure the values for my machine, specifically. Right now, I’ve got bigger hurdles than maxing out the torque, but I’m gonna want to do that at some point.