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Revision to Connecting and configuring filament-out sensors

Ian A-S

+=== RepRapFirmware 3.3 and later ===
+In RRF3.3 if you configure a filament monitor using M591, when it reports no filament RRF will try to run filament-error#.g where # is the extruder number, or failing that filament-error.g. If neither of those is found then it runs pause.g.
=== Firmware 1.19 and later ===

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