RE: Constantly recalibrating
I don't know if this is related or not, but I have a pre-assembled Core One. I was having the constant recalibration issue. 5 days ago I noticed it having issues leveling the print bed and noticed a clacking sound when the print head moved quickly. I watched it closely and noticed play in the print head. I stopped the print and jiggled the print head and found it was loose! The four screws shown here were almost falling out. I re-tightened them (with some loctite for insurance) and re-assembled everything and found my bed leveling issues solved and haven't had the constant recalibration issue since. That last part may be a coincidence, but you may want to wiggle your nextruder and see if it's loose.
RE: Constantly recalibrating
It's likely that it's not the belt tension that's the problem. It's the gantry not being square. Squaring the gantry is more important the tightening the belts. See this article here:
https://help.prusa3d.com/article/adjusting-belt-tension-core-one_845048
See steps 1 through 5. There needs to be ZERO play between the gantry and the front stops. Loosen the belts until you get there. Then, tighten them back up slowly, alternating sides, until you reach as close to 85hz on each belt WHILE keeping the gantry aligned. This requires frequent checks while adjusting the tension back up.
RE: Constantly recalibrating
I re-adusted my belts using this guide. There was play in the gantry before, but not after adjusting. But it didn't help. What I found has helped was the bed being close to the top, but that can't be adjusted after powering it off, since the zero is wrong.
It's likely that it's not the belt tension that's the problem. It's the gantry not being square. Squaring the gantry is more important the tightening the belts. See this article here:
https://help.prusa3d.com/article/adjusting-belt-tension-core-one_845048
See steps 1 through 5. There needs to be ZERO play between the gantry and the front stops. Loosen the belts until you get there. Then, tighten them back up slowly, alternating sides, until you reach as close to 85hz on each belt WHILE keeping the gantry aligned. This requires frequent checks while adjusting the tension back up.
RE: Constantly recalibrating
I noticed that if i leave the head at its parked position in the corner, it has a higher chance to just keep on banging trying to find its limits. If however i first move it away from where it checks, the next time it needs to calibrate it just bangs the side for a lot less. Its as if that travel distance sort of pretensions the belt?
Dunno. just something i noticed.
RE:
already done this a couple of times, makes no difference, squaring the gantry
RE: Constantly recalibrating
Also have the same issue - spends ages hitting the extruder on the corner back and forth.
Today I got sick of the noise and reset the printer - after which it went straight through!
Surely this can't be 'normal' behaviour??
RE: Constantly recalibrating
Yeah, i started doing it as well. When i see it starts banging more than normal i just hit reset.
Also have the same issue - spends ages hitting the extruder on the corner back and forth.
Today I got sick of the noise and reset the printer - after which it went straight through!
Surely this can't be 'normal' behaviour??
RE: Constantly recalibrating
I noticed mine was getting stuck in a loop during the homing and leveling checks. After adding gcode to pause heating before those steps, it passes a lot faster. That was on Sunday and I haven't had a chance to print anything else since then, but I'm optimistic this workaround fixed at least some of my issues.