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I am trying to convert to a dual head on my mixing prusa m201 i have the gtm32 board with the micro usbport. . i have replaced the mixing head and wired into the proper places on my gtm 32 mother board which has locations for 3 extruders and thermisters, but it seems i need a firmware change to allow this. i have read through the thread here is the firmware file several messages above the one i need to do this? any help would be greatly apreciated