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geneb: I have to give it to ya. It was a wiring issue. Not intermittent. The main hot-end red & black wires were reversed in the pre-made whip I bought with the other parts for this upgrade. It was JJ w/SeeMeCNC's first suggestion when I created the support ticket. Apparently at least one other whip ...

It works whenever the hot end is not heating. I've checked all of the connections.

Any other possibilities?

Understood.. trying to figure out why it is stopping.

Just finished hooking this exact setup up. I added the 713maker mount at the same time and got the mount for the accelerometer board from them. Not super hard - followed these instructions: https://seemecnc.dozuki.com/Guide/Rostock+Max+v1-v2+HE280+Hotend+Upgrade/49#s402 For whatever reason those ...

Different, but not better. Still not fixed.

FYI, one of the axes was reversed when set to v3.. so homing was briefly quite exciting.

Also tried HOTEND 2 since it only defined one PWM set of options.. no change.

One more piece of information. My "HEAT1" LED is flashing along the same beat when preheating the hot end, and it stops flashing when the hot end temp goes under 40C.. this has to be a clue. If I've done this upgrade, is my machine now a v3? Maybe that's what I should have set in the firmware? Going ...

My setup: Rostock MAX v2 (originally the kit, upgraded arms, cheapskate, etc..) E3D v6 hot end I went all-in on the accelerometer probe board, wiring harness, new 713maker effector and got it all hooked up using the extremely (possibly overly) detailed guide here: https://seemecnc.dozuki.com/Guide ...