Printer won't extrude walls of prints.

MurphDurtay

I recently got a new 1.0mm nozzle for some very large prints. I'm running:

-Duet Mini 5+ Wifi
-Reprap Firmware: 3.5.4
-Duet Web Control Version: 3.5.3
-Mosquito Hot End with Bondtech CHT 1.0mm nozzle
-Bondtech LGX lite V2 Extruder
-Home-Built CoreXY printer

I'm trying to print some circular discs out of TPU however the printer will not extrude any plastic while traversing the walls of the print. It will trace the path of the wall but the extruder doesn't move. Once it has moved onto the filling in-between the walls everything extrudes fine.

I'm using Cura and am currently printing the TPU at 245C with retraction disabled.

It's a very strange issue that I can't figure out. Has this happened to anyone else?

MurphDurtay

@MurphDurtay 20250126_164017.mp4

This is a video showing the issue.

dc42

@MurphDurtay we'll need to see your config.g file and the GCode file too.

MurphDurtay

@dc42 sorry about that, here is the Gcode file and my config file.

config.g

CFFFP_3d Printer Foot v2.gcode

MurphDurtay

switched back to a 0.5mm nozzle. and still have the same problem. Can anyone confirm if the
G-code I posted has the same issue as the video when printed on another coreXY?

Phaedrux

; Extruders
M584 E0.0 ; set extruder mapping
M350 E1 I1 ; configure microstepping with interpolation
M906 E1100 ; set extruder driver currents
M92 E562 ; configure steps per mm
M566 E3000 ; set maximum instantaneous speed changes (mm/min)
M203 E12000 ; set maximum speeds (mm/min)
M201 E5000 ; set accelerations (mm/s^2)

This is a very strange extruder setup. What kind of extruder is this?

Are you able to extrude in free air from the DWC extrusion commands?

Phaedrux

Try reslicing the file with the same speed for walls and infills.

MurphDurtay

@Phaedrux said in Printer won't extrude walls of prints.:

; Extruders
M584 E0.0 ; set extruder mapping
M350 E1 I1 ; configure microstepping with interpolation
M906 E1100 ; set extruder driver currents
M92 E562 ; configure steps per mm
M566 E3000 ; set maximum instantaneous speed changes (mm/min)
M203 E12000 ; set maximum speeds (mm/min)
M201 E5000 ; set accelerations (mm/s^2)

This is a very strange extruder setup. What kind of extruder is this?

Are you able to extrude in free air from the DWC extrusion commands?

What is strange about the extruder setup? It's the Bondtech LGX Lite V2. It extrudes fine in free air through the DWC, even on the infill of prints, just not the outer walls for some reason.

I'm currently warming up my printer to try reprinting with all of the speeds set to 45mm/s to see if that helps.

MurphDurtay

@Phaedrux said in Printer won't extrude walls of prints.:

Try reslicing the file with the same speed for walls and infills.

Just tried this and still the same behaviour as the video. It also won't extrude while printing out the skirt either, which it has done this whole time I just forgot to mention it...

Phaedrux

Why 1x micro stepping?

Have you tried with pla instead of tpu?

MurphDurtay

@Phaedrux I think that may have been the default when I used the firmware configurator but I can't remember.

I tried printing the same part with a 8mm Brim and the printer doesn't extrude when going around the rim except for a small section of the brim. The small bit that does extrude always occurs at the same spot in the brim.

I really think this is a slicer or firmware issue, but I don't have any PLA to try right now. I could try with CF Nylon but I have never printed with that so it may just be adding another variable.

If anyone else is running the LGX lite V2 and has firmware settings that work for them please share them with me.

MurphDurtay

@Phaedrux said in Printer won't extrude walls of prints.:

Why 1x micro stepping?

I just tried 16x microstepping and there was no change, I also tried 32X microstepping with 1124 steps per mm and still no change.

tas

@MurphDurtay if it helps here are my settings but not a V2:
Duet 2 Wifi, Bondtech LGX Lite, E3DV6 hotend, 0.4mm NozzleX.

M584 E3;
M350 E16 I1;
M906 E400;
M92 E568.3 ; (eSun PLA+)
M566 E8000.00;
M203 E6000.00;
M201 E5000.00;

Your current is way too high. The Bondtech specs state 550-650 mA.

Phaedrux

TPU is hard to print with to begin with. Testing with PLA would be my next step.

When was the last time prints were working correctly?

I doubt it's a firmware issue, but it could be related to your configuration. 16x microstepping is the norm. If your steps per mm are way out of whack for 1x microstepping no wonder things aren't extruding well.

The sliced gcode file you shared shows nothing out of the ordinary when previewed in prusa slicer gcode viewer.

MurphDurtay

@tas I just tried your exact settings but it still won't extrude along walls, brims, or skirts. As for the current I just went off of the datasheet for the stepper which is rated at 1 amp. I didn't consider that the stepper datasheet could be peak current and the config is in RMS so that would be a max in the config of 707ma so I turned it down to 700, but still having issue.

Can anyone see if the G-code I posted extruder should be extruding while tracing the wall?

Phaedrux

The only difference between the walls and infill is the extrusion width. Though the volumetric flow is lower on the walls than infill due to being slower.

That still may be too high for TPU. Try dropping the print speed by half.

MurphDurtay

@Phaedrux said in Printer won't extrude walls of prints.:

TPU is hard to print with to begin with. Testing with PLA would be my next step.

When was the last time prints were working correctly?

I doubt it's a firmware issue, but it could be related to your configuration. 16x microstepping is the norm. If your steps per mm are way out of whack for 1x microstepping no wonder things aren't extruding well.

The sliced gcode file you shared shows nothing out of the ordinary when previewed in prusa slicer gcode viewer.

-I'll have to wait to get some more PLA but I don't think it's a material or bed adhesion issue

-The last time prints were working correctly was before moving my printer, I had to move the printer and make a new SD card with the firmware because the old one got broken in the move. These are my first prints on the new SD card.

-I have changed the settings to 16x micro-stepping and 564 steps per mm which came from the bondtech website

Phaedrux

Try prusa slicer as a sanity check?

How fast are you extruding into free air when you're testing? Are you actually matching the feed rates that would be used during the print?

MurphDurtay

@Phaedrux Yeah I'll try that next

MurphDurtay

@Phaedrux said in Printer won't extrude walls of prints.:

Try prusa slicer as a sanity check?

How fast are you extruding into free air when you're testing? Are you actually matching the feed rates that would be used during the print?

Same behavior with prusa slicer, I'm Extruding at 2mm/s in DWC however it doesn't have a problem extruding anything but walls, brim or skirt.