Topics created by Lo-Fi

@Phaedrux

Going back over my notes, I originally had extruder max speed at 3600, then subsequently fiddled with it. I've just rebuilt my config entirely and all seems well.

I do still have an issue with the MFM reporting too little movement (<40%) with pressure advance on, though I'm homing in on whether it's slipping itself or whether there is actually some under extrusion going on. My feeling so far is it's struggling to react to rapid moves, but only some slow motion footage will be able to confirm that. I can't hear any skipping and the filament feels like its movement matches the extruder. My prints usually run around the 80-110% mark and I've had the MFM set 70% - 120% for as long as I can remember.

@markz @zapta

At this stage I wouldn't rule anything out. I'd have some reservations about assuming that the relationship is a straight up trig function as you're relying on the leadscrew to be quite linear itself. There's also considerable force on it. At low Z heights, any small deviation would be amplified, so the table would be better assuming it's based on measured heights not calculated. Experimentation needed for both methods 🙂

@dc42 Quick update:

I redesigned the housing and re-printed, paying particular attention to having the filament only in contact with the PTFE, having the PTFE securely mounted closest to the hob and passing the filament over the hob such that the idler has very little work to do. I believe RC2 fixed the "sensor error" issue and the housing update seems to have cleared the frequent spurious movement readings I was still getting.

I'm now consistently getting:

Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 26.67mm/rev, allow 70% to 130%, check printing moves every 6.0mm, version 3, mag 131 agc 69, measured sensitivity 26.69mm/rev, min 98% max 102% over 13106.6mm

Not had an unwelcome print pause in days now.

2022-03-11 13.44.38.jpg

I could probably refine the design a little more. I think a full case with strain relief for the cable(s) would be a definite plus.