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I finally found the problem, it was the wiring. One of the wires going into the connector on the rumba was broken right at the terminal...
Started having trouble with the Z axis on our printer. It has worked fine for over a year then after adding octoprint to it (which I don't think...
Apparently they have corrected the z axis cable since writing that step, the Y shaped cable Alex pointed to is the correct one.
I'm in the commissioning phase of my build and I have a hot end fan that isn't coming on at 40 deg. I have a dual hybrid set up. My fan for hot...