@timschneider said in Sensorless Filament Monitor:

Just to get you right, you are speaking about an extruder pushing 1.5 meter filament per 15 second?

DOH! I was not clear. It's not 1.5M of filament (inbound to the extruder) in 15 seconds, but 1.5M outbound from the nozzle. So the part will be missing something.

Regarding an interface in RRF - I'm not aware of any gcodes or object model properties that would give a current value. I don't know how the board enforces motor current limits, but if it's done in fw, then there might be a way to get it. I guess it would be possible to add a current sensor.

An interesting, but off topic discussion would be about making a list of the typical things that can go wrong during a print, the action that a user would take if they were present (and noticed), and whether it's possible to monitor in a way that would allow the action to be taken automatically. The present topic is one example about "end of filament", and/or "clogged nozzle" and/or "too-low extruder traction on fialment".

I do not think your ideas help. I tested them but they did not improve anything...

but I found the mistake!

You know....in programming you are often start counting with 0....not with 1. So my x Stepper is not P0.1 but P0.0....

Oh my gosh...works now.

As @carlosspr says. For stall detection to work, the feed rate in your G1 S1 commands must be at least (60 * m915-h-value / full-steps-per-mm) . If your printer has 80 steps/mm @ x16 microstepping, that's 5 full steps/mm. You are using H200 in M915, so the minimum G1 S1 feed rate would be (200 * 60)/5 = 2400.