Core One suddenly struggling to print - underextrusion/clicking 15% through a print
Hello all,
I got a Prusa Core One XY a few months ago and it printed fine in PETG, PLA and ABS for about a month. For reasons I don't understand, it began failing to extrude about 15% the way through a print using Prusa Slicers generic COREXY 0.4mm HF profile and generic PLA profiles, with CORE ONE 0.2mm layer height speed and balanced. It gets to a certain height (or volume, or time) in a print, specifically benchy but has happened on other models too, then it stops extruding and I hear clicking.
Printing the demo benchy gcode from the USB gets far/finishes but with severe quality issues; large gaps in walls, underextrusion on the roof of benchy and the nozzle catches the chimney and swirls that around.
- Updating firmware
- 2 cold pulls, although i couldnt match this 1:1 with prusa's instruction since i could not push filament through manually with the idler disengaged, had to make the extruder motor extrude.
- Heater nozzle test failed last week but seems to pass now
- Fans seem to be working and pass test
- Other models
- Other filament
- Drying filament
- Verifying idler screws are flush
- Importing Gcode from (un-ideal) demo benchy, printer
see below, top is using slicer gcode where it just stops extruding, bottom is the demogcode
Best Answer by Jacob Chappell:
Hi all, an update: it has been fixed.
Turns out someone opened the gearbox for an inspection after a PETG clock, not expecting that to be a big deal or mention-worthy.
The PG ring was assembled the wrong way round, with the small chamfer on the wrong side. After fixing this and re-calibrating, it appears the issue has resolved.
RE: Core One suddenly struggling to print - underextrusion/clicking 15% through a print
I experienced similar behaviour on my XL5 using the HF 0.4mm profiles. I found that some filament cannot print at high extrusion speeds. I had the same clicking noise. I also have a Core One but have not had this experience. However, I have reduced the volumetric flow from 21 to 18 for some of the filaments. When I did this for the XL, it corrected the problem
Might be worth a shot on the Core One if you have not done so already.
RE: Core One suddenly struggling to print - underextrusion/clicking 15% through a print
I lowered it from 21 to 18 and really dialled back the speeds to no avail. Same failure, at the same point.
RE:
To make sure you've not missed something basic, work through: https://help.prusa3d.com/article/regular-printer-maintenance-core-one_829710
Cheerio,
RE: Core One suddenly struggling to print - underextrusion/clicking 15% through a print
Try replacing the troublesome HF nozzle with a regular 0.4 nozzle and use a structural profile instead of speed,
RE: Core One suddenly struggling to print - underextrusion/clicking 15% through a print
I have a similar issue. See the video. Because I have a clear acrylic cover, you can see what it's doing.
RE: Core One suddenly struggling to print - underextrusion/clicking 15% through a print
Bought a brand new non-high flow 0.4mm from prusa, set the printer hardware and slicer settings to non-high flow, but the issue still remains. I used 0.2mm layer height "structural" pre-set. It fails at almost the exact same point.
I'd read lowering the heat break target temperature in the gcode from 36 to 32 for PLA, which didn't affect anything.
Just tried PETG with the same issue.
RE: Core One suddenly struggling to print - underextrusion/clicking 15% through a print
Hi all, an update: it has been fixed.
Turns out someone opened the gearbox for an inspection after a PETG clock, not expecting that to be a big deal or mention-worthy.
The PG ring was assembled the wrong way round, with the small chamfer on the wrong side. After fixing this and re-calibrating, it appears the issue has resolved.