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@tkln I guess, that's not doable right now, but you could try sensorless homing for one of the motors on each tower.
@Jim46 may I add to bearer that RRF3 has a changed syntax, please look to link https://duet3d.dozuki.com/Wiki/Gcode#Section_M574_RepRapFirmware_Num_3 Some parameters changed, like the S parameter. And parameter P is important too.