Why multi extruder commands are only outputting on first extruder?

I just assembled my mk2/s with multi-material and I cannot trace where my issue is coming from. The issue is while the controls on LCD for extruder 1 work perfect, if I load/unload extruder 2 or 4, it makes extruder 1 function opposite direction rotation. Controlling extruder 3 makes extruder 1 work but with correct load/unload rotation. I have compared/contrasted this issue with the manuals/wiring and combed this over for the last few hours and I am stumped. Everything seems connected as pictured.

I have not attempted any printing since assembly, but it has been updated with the Rambo1.3MM firmware from website and passed all calibrations. I have not received any functions from extruders 2,3,4 yet. Any ideas?

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My fault, Cable from multi board was not plugged into the open pin connection properly. Finished a couple multi prints so far. Working well except for some hang ups switching filaments in multiplexer. Thanks for your help!


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Hi Christopher,

for the start, please recheck again all connections, connectors must be fully seated.

Next try to make the full factory reset:


Then flash the firmware for MM again:


Let me know if it helps, if not, we will proceed further. Video will be great so I can discuss this with colleagues ;)

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Christopher Murray will be eternally grateful.
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