RE: Core One back to head banging with firmware 6.4.0 - any tips?
At the initiation of the print it homed with two bangs to the right (X axis), two bangs to the front (Y axis) then about ten more, softer bangs in the X axis again.
So the upshot is the banging is somewhat less, and a lot quieter, but still I think is excessive. The print quality is excellent, however.
The minimal pattern of bumps for the precision homing is: right right; front front; right front, right front, right front, right front. So eight bumps follow the initial two double-bumps. If your count of 10 refers to individual bumps, it is not far from the ideal pattern.
RE: Core One back to head banging with firmware 6.4.0 - any tips?
Had another massive head banging session on a print job last night. I heard it knocking away from another room so don't know for how long, but it was extensive.
After that the print finished without any issues and I ran the homing calibration again, and so far it's back to behaving. Belt tension was still in the perfect range with the lower belt 1Hz lower than the upper.
For whatever reason it seems in my case it just needs that homing calibration periodically. Still, it does seem like a recent "feature"
RE: Core One back to head banging with firmware 6.4.0 - any tips?
It seems to me the Core One periodically just forgets where its head is and has to do the headbanging thing to reset itself. My Mk4S never did anything like this so the Core One must be using a different homing algorithm. I think the belts do better when the upper belt is in the 95-98Hz range (I.e. on the tight side).
try this: get two 2.5mm hex drivers. Back both drive tension screws out until they release. Deactivte motors or turn power off. Push Nextruder to middle (R-L) then pull all the way forward. There should be zero gap. Even a micro-gap is unacceptable. Both sides should hit the stops at exactly the same time. If not, tweak the gantry alignment until they do. Re-engage the screws two threads on each side. Then insert your hex keys one on each side and tighten both screws the exact same amount. Once you think the belts anre about right, engage the manual belt tuning module and click start. Use the dial to lower the Hz way down, like maybe to 70. Observe the upper belt but on the left side, not the front. It should be vibrating grossly all over the place. Turn the knob up or down until the upper belt does the same behavior in the front. The oscillation should be HUGE, I mean looking like it’s oscillating a half inch/12mm back and forth. Fine tune the knob to maximize the oscillation. Now look at the Hz setting on the knob. If it’s lower than, say 98, you will have to tighten the belts. If it’s higher, you will have to loosen. Now turn the knob until it reads 98. Go through the tuning module again, just to excite the belts. Using your two hex drivers, tighten or loosen both tensioning screws the same exact mount depending on the first results above. Watch for the same wild oscillation of the upper belt like you saw the first time. Stop further belt dusting once you get to that point. Click through to excite the lower belt. Turn the knob down and observe for that same wild oscillation. You should see the lower belt go through the same wild oscillation maybe 2-4Hz lower than what the upper belt oscillated at. There generally should be no further adjustment after you’ve set the upper belt.
RE: Core One back to head banging with firmware 6.4.0 - any tips?
It seems to me the Core One periodically just forgets where its head is and has to do the headbanging thing to reset itself.
Can you pinpoint under which circumstances this occurs? I think it is normal that the Core One does another "precision homing" before each new print -- even if it has homed before since it was powered up. Is that what you get, or does it re-home under other conditions?
RE: Core One back to head banging with firmware 6.4.0 - any tips?
Typically only when starting each new print. I have also had it do a mini headbang ((3-4 bangs) when changing or unloading filament.
RE: Core One back to head banging with firmware 6.4.0 - any tips?
Typically only when starting each new print. I have also had it do a mini headbang ((3-4 bangs) when changing or unloading filament.
Both are normal behavior. The "mini headbang" is a low-precision homing: right right, front front, if I remember correctly. I was wondering why the printer would need to know its XY position for filament (un-)loading, but someone here on the forum pointed out that the firmware probably wants to bring the PTFE tube into a relaxed position with a large bend radius. That makes sense to me.