Magnetic filament sensor interference
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Hi
on one machine the magnetic filament sensor is giving me "too little movment" every around 30 min.For testing purpose I excluded the hotend by connecting the filament ends to make a loop so the same 1 meter of filament is going in and out forever.
Wondering if the magnetic filament sensor cables are prone to interferences as my cabling are 3 meters long and its a bundle of everything going to the hotend.
are interferences something to look at ?
During printing:
M591 D0 Duet3D magnetic filament monitor on input 3, enabled, sensitivity 25.86mm/rev, allow 70% to 130%, check every 3.0mm, version 4, mag 133 agc 51, measured sensitivity 26.04mm/rev, min 93% max 107% over 2541.5mmAfter error:
M591 D0 Duet3D magnetic filament monitor on input 3, enabled, sensitivity 25.86mm/rev, allow 70% to 130%, check every 3.0mm, version 4, mag 132 agc 51, measured sensitivity 26.02mm/rev, min 50% max 122% over 4302.9mm -
@paboman In most cases, cabling issues are reported as „sensor error“. The message „too little movement“ means exactly that, so either the filament does not move as it should, or the sensor system doesn’t register this movement.
As the reported mag and agc values are within the tolerances, I think you should have a closer look at the mechanics of the MFM. This includes the filament path and smooth operation of the idler (including the ball bearing of the idler).
In your video, I notice the absence of PTF tubes on both sides of the sensor. Please add them, they are needed to guide the filament.
After ruling out mechanical errors, you might want to look at the cabling: at a length of 3 meters, I think you should go with a USB cable and separate that from your bundle, at least for testing.
