Duet3D Magnetic Filament Monitor Mod
Description
/// Update: I have a version 2 of this modification located here https://www.thingiverse.com/thing:4605070 /// Do you have a Duet Magnetic Filament Monitor, and wish it was more reliable, well your wish has come true! I was about ready to give up on my monitor, I had it disabled 90% of the time because it would give me false filament runout detection constantly. So, I decided to open it up and check the spring tension, but I found that the bearing had shifted inside the housing instead. There is a lot of space for the idler assembly to move around, and if it moves to high up, the bearing no longer presses against the filament. The photos show where I originally found the bearing, and how much space is in the cavity once I pushed it back down. So, I made a simple little spacer that fits on top of the idler assembly, and it's small enough that it just floats around and it doesn't press on the bearing, so from what I can tell the bearing is still allowed to spin, but it now stays in place, and remains on the filament. Normally I would get a false filament runout detection every 10 to 30 minutes, sometimes I would go to bed with a print running just to wake up the next morning to see that the printer is paused because it detected a filament runout shortly after I went to bed, but there was plenty of filament, and it wasn't jammed. Since putting this spacer in, I've been printing for the last 2 days without one false trigger. We are in the process of designing a better idler assembly, and when we come up with one that is reliable, I'll post it here. So, if you have a Duet Magnetic Filament Monitor stuck in a drawer someplace because it just didn't work well, dig it back out and give this little mod a try!
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