NEMA23 2.8amp X/Y steppers connected to Duet2 Wifi
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I swapped Y and E1 to help with the heat, I redesigned my Duet Wifi and Duex5 mounting brackets so that a 40mm x 40mm x 10mm fan mounting at one end of the control boards so that the fan is half below and half above the Duet boards and air flows across the drivers per dc42's suggestion. I also added heatsinks on the drivers and align them so the fins of the heatsinks allow air to flow unrestricted.
I have completed 4 30 hour prints without any over heat warnings.
Thanks for your help and saving me $$.
Some day I'll switch to Duet 3.