Under-extrusion

OmiCron · November 3, 2022, 2:24am

A reason why I’m starting to have under-extrusion with all my filaments? I changed the nozzle to eliminate the possibility of a partial clog and ran the calibration tests after. The square is one layer height (0.2mm).

mzuidwijk · November 9, 2022, 5:49pm

I’ve notices a lot of under extrusion on the first layer. I tried unclogging the nozzle, even installed a new nozzle to rule that out. It doesnt matter which filament (Bambu lab matte PLA, Extrudr NX PLA, Prusament PLA, PolyTerra PLA, eSun PLA…)

mzuidwijk · November 9, 2022, 5:50pm

Hifihedgehog · November 9, 2022, 7:20pm

So weird. Some questions:

Are you running with the stock nozzle (0.4mm) or one of the other sizes?

Is the extruder intact? Do the extruder’s gears look to be in good condition and do they spin freely with no grinding sounds or catching, slipping or hesitation?

Are you using the AMS? If so, is it working correctly as well with no grinding sounds or catching, slipping or hesitation?

I suspect it may be a hang-up somewhere in the filament path above the extruder since you already eliminated that possibility by replacement.

OmiCron · November 10, 2022, 2:18am

What I tried:

Changing the nozzle
Changing the extruder
Cleaning the rods
Tensioning of the belts
Tramming of the bed (from the wiki)
Multiple filaments, thus multi AMS slots
Full recalibration
Flow calibration and bed levelling on each print

mzuidwijk · November 14, 2022, 1:34pm

Replaced the nozzle with a new one, replaced the extruder with a new one. No issues in/with the AMS. And it is only on the first layer.

mowcius · November 14, 2022, 9:41pm

This looks like the textured plate, which due to how the top of the texture is measured with the nozzle, you’re always always likely to have what looks like first layer underextrusion without a z-offset.

github.com/bambulab/BambuStudio

Z-offset cannot be adjusted (for textured PEI plate).

opened 11:54AM - 19 Sep 22 UTC

RobinWhitfield

feature Printer

Due to the nature of the textured PEI plate, the nozzle typically wants to be sl…ightly closer to the print surface or you can end up with gaps on the first layer infill. For some filaments (PETG) you don't however want to have such an offset or they can stick too well and damage the plate surface, so this cannot be a universally set value for the plate. It would be great to have this as a per-filament option, or ideally two. One for general printing (default 0), and another for the textured PEI plate.

Nimrod · November 15, 2022, 2:18am

added my 2c on that github thread. Z offset is such a simple request. no idea why it is not already in the filament settings at the very least.

OmiCron · November 21, 2022, 2:08pm

For my picture, it was printed on smooth PEI.

Malte · May 11, 2023, 9:34pm

My X1 starts with under extrusion.
Did you manage it?

Jrock · May 11, 2023, 10:12pm

If youve been printing a lot try a cold pull

I use white PLA because it’s easier to see all of the gunk

Cold pull is super easy

OmiCron · May 19, 2023, 5:02pm

You could try to tram the bed.

Peter_b · August 2, 2023, 11:41am

Was there any solution? If I set to silent which is slow the print gets fine instantly. You can see exactly where the hair part stops where filament breaks and is pulled up.

Artio · January 17, 2025, 2:32am

Did you ever get this resolved? My printer has suddenly started this and nothing seems to help.