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@scottypres said in M591 Simple Filament Sensor Trouble:
E0
I think the E0 should be removed.
https://duet3d.dozuki.com/Wiki/Gcode?revisionid=HEAD#Section_M591_RepRapFirmware_1_21_to_2_x
If you can feed the filament past a toothed wheel before it reaches the filament monitor, that may put enough texture on it for the laser sensor to see it better.