Skipped Layers on Filament Change
I have been fumbling with this issue for a few months now. In short, once every couple hundred tool changes, I tend to run into an issue where a layer one of my filaments will load and trigger the finda but the filament will not extrude, however, other filaments will continue no issue. This leaves gaps in prints and completely ruins them, and sometimes needlessly continues wasting filament since the print does not complete. This issue seemed to go away when I upgraded to latest mmu3 firmware (and revo 6 firmware for printer) but after about 1700 tool changes it has come up again.
Things I have tried:
- tried both stock and 2.5 ID tube between selector and extruder
- Tension on gears in extruder (up and down)
- finely tuned, multiple times, finda sensor.
- has occurred on old mmu2s firmware, TZB firmware, and now happening on MMU3 firmware.
- Have used a MMU for about 1.5 years and this only recently started to be an issue.
Any help would be greatly appreciated
Best Answer by Shabubu:
After all this time and typing this all out I may have figured out the issue. I realized this issue only seemed to happen with one brand of filament. While debugging an issue a few months ago (ended up being a power issue to the MMU2S) i had changed some of the temp settings for this filament from 208 to 205 and hadn't realized this was around the time this issue arose. What I think was happening was the temp was too low for the tips (harder to tell since I use a revo 6) and the filament sensor was getting false positives for being loaded, even with the new firmware. After increasing the temperature I have not run into the issue yet.
RE: Skipped Layers on Filament Change
After all this time and typing this all out I may have figured out the issue. I realized this issue only seemed to happen with one brand of filament. While debugging an issue a few months ago (ended up being a power issue to the MMU2S) i had changed some of the temp settings for this filament from 208 to 205 and hadn't realized this was around the time this issue arose. What I think was happening was the temp was too low for the tips (harder to tell since I use a revo 6) and the filament sensor was getting false positives for being loaded, even with the new firmware. After increasing the temperature I have not run into the issue yet.