Chronic Under-Extrusion - Core ONE
Has anyone else had any severe under-extrusion issues with the Core ONE? I got the pre-assembled version and have had to adjust quite a few things out of the box. I have multiple side effects; mostly clicking/grinding filament and stringy filament. Both issues are intermittent.
Troubleshooting done so far:
Insured that the nozzle is not clogged via solvents, cold pulls and needle cleaning. Tube is not dented and is straight. Depth is set per troubleshooting steps
I've tried multiple combinations of print speeds, nozzle temps and filaments.
Adjusted idler arm for extruder to spec and out of spec during testing. Ran the planetary gearbox calibration precisely, multiple times. Reassembled gear box and inspected parts.
Bowden tube is clean and free.
Best results were from a VERY loose gearbox cover on the extruder but results still vary. I'm resorting to the community because a loose gearbox cover can't be the solution. It is so loose that it will likely cause excessive wear on the extruder components eventually.
Any input would be greatly appreciated. I'll try anything at this point.
Thanks!
RE: Chronic Under-Extrusion - Core ONE
Stringy filaments usually is the result of wet filament. Did you try to dry out the filament? Also, same problems if you run e.g. PLA and PETG? One thing you could try is to disable the external filament sensor and load the filament directly into the extruder (you may want to remove the top cover for ease of access) and see if this changes anything, ruling out any friction etc etc on the filament before it reaches the extruder.
clicking/grinding filament and stringy filament
Agreed, all of these, especially the last, can be due to wet filament. Dry the filament and try again, come back if problems persist.
Cheerio,
RE:
Thanks for the responses!
I only used PLA and PETG at the moment. One spool of PLA was relatively wet but the other was a sealed Galaxy Black that came with the printer. I know that doesn't mean that it is dry but it should have been dry enough for testing. I have various other filaments in the dryer now for later testing.
With more observation it looks like the extruder doesn't have the grip or torque to pull off of a full spool of filament. Maybe the factory routing of the Bowden tube is the issue going into the top of the extruder though I would expect it should be able to pull through that extra resistance.
I will try bypassing the Bowden tube to test the extruder specifically. I'm working on getting new nozzles as a last ditch effort which is disappointing because this one has less than nine hours of print time and paying for shipping and dues from the EU is a pain.
Any additional thoughts would be helpful. I'm starting to think, perhaps foolishly, there is some issue with the the extruder motor that was sent with the unit.
Thanks!
Once you have consistently dry filament (and possibly done a cold pull to clear any debris) the grinding and clicking should just be a matter of tweaking the extruder idler pressure.
Cheerio,