Which Slicer?
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BTW, I recently discovered that although the Duet is happy with just having the M82 in the start code to select absolute extrusion mode, it's also a good idea to also have G92 E0 to reset the length extruded so far to zero. This is because some non-Duet printers (e.g. Marlin based machines) seem to fail to zero that when a print is started and so the extruder gets very confused on the second print of the day!