Like I said have happens at least one time on each corner, and I had confirmed the connectors were perfect after the first one The steppers are rated at 2.8a.Īnd maybe I wasn't clear, but STOCK wiring that came with the stepper had this happen. So now as soon as I see a glitch, I shut it down and check all z connectors. Have gone through 4 or 5 molex connectors already, since I don't reuse them after they've had an issue, initially I thought it was just a random glitch, because a reset cleared the issue, but then it would stop moving one corner or start shaking, and by then the connector was really melted, and really hard to remove. It is basically like clockwork, after about a couple of weeks a connector which was perfect before is now fritzing out and I check and see it has a brown mark on the plastic.

Curious that it started happening after I switched to 4 lead screws and single start lead screws. I guess if it happens again I'll bite the bullet, pull the duex5 out and replace the molex connectors with screw terminals.

These are the only connectors I've had issues with - fairly certain it's because they're the larger nema23s. Of all the wire runs on this machine, and there are a lot with 16 steppers, 4 extruders, etc, the z steppers have the easiest wire runs since the steppers are on the bottom of the machine, and so is the board. I have 2 50mm fans blowing across the duet+duex5 combo and duet doesn't go over 30 c, and I checked connector temperature and it's barely above ambient.

Single side molex connector