Magnetic Filament Sensor - false alarms

Hobby-Store

Hi,

Please help our client or do you accept the sensor under warranty?

dc42

I am trying to run your client's print, but it's too large for the bed of my printer. I will try a workaround tomorrow.

dc42

@gunrak, I see the following command in your print file:

;Enable Stealthcop Tuning move

G1 E0.2 F100

Does this mean that you have configured the extruder driver in StealthChop mode? I advise against that, because StealthChop can't adapt to rapid fluctuations in load.

gunrak

@dc42

You are right, I was experimenting with StealthChop, and apparently I forgot to remove it from my other computers slicer's Start G-Code. StealthChop is not enabled in config.

I still did not give up, and other day was experimenting, my thought was that maybe sensor is to close to extruder. I have Hemera and stepper motor is right there and I thought maybe that was causing interference so I went from 4cm to 8cm long PTFE tube now sensor is mounted further away from stepper motor.

All other settings stayed the same, but this time I printed with PETG instead of PLA, still 0.8mm nozzle, diferent part. Absolutely nothing changed, exactly the same pattern as before.

dc42

@gunrak, have you see this thread https://forum.duet3d.com/topic/21958/magnetic-sensor-reports-negative-min-value ?

The sensor should be as close to the extruder as possible. Otherwise, when the extruder retracts, the filament tends to bunch up in the bowden tube between the sensor and the extruder, instead of back-feeding through the sensor.

gunrak

@dc42 it was a while since I posted. After I read thread you mentioned I mounted sensor as close as possible to extruder and since then I did not receive any failure or false alarm (printed couple spooles).

Thank you for help and patience. Issue solved.