Issue with single extrusion fill :(

[slaughter2k]

Hi guys... I do have an issue with single extrusion fill.
As everything else is fine (no under or over extrusion on any surfaces) and even single extrusion walls are looking good (at least on first subjective look):
--> I dont get the single extrusion fill working. It is always severe underextruded. Is it possible that I checked any option that might prevent a proper single extrusion fill??
Attached a picture (left: process, right: outcome)

My single extrusion setting

[rrdavis]

Maybe your extruder is having trouble extruding that much plastic (slipping, pressure build-up, etc). Try reducing all of the speeds by 50% (to do that, just set the default printing speed to half of what it is now). That should give your extruder more time to extrude the thicker lines.

[slaughter2k]

hm, good idea, but already tried that.
In general the extruder is running really flawless. I can extrude a lot more plastic than this. Current speed setting is 40mm/s. If I screw up the extrusion rate I do not have any issue to fully overextrude everything --> so a mechanical restriction of the extruder itself should be unlikely

[arhi]

50-200% can be too high range for many printers, try to limit range for start 80-120%

[arhi]

also my exp with s3d and single extrusion - you need to have your printer calibrated so that extrusion modifier is 1.00 (so modify either E steps per mm on printer or filament thickness in other/filament properties.. but keep extrusion modifier 1.00)

[slaughter2k]

Might it be possible that my problem is related to my printer firmware? So...does single extrusion use any "exotic" commands?
I do have a Repetier firmware with a RADDS board on an arduino due
(just thinking in all directions currently )

[blackbird2016]

Might it be possible that my problem is related to my printer firmware? So...does single extrusion use any "exotic" commands?
I do have a Repetier firmware with a RADDS board on an arduino due
(just thinking in all directions currently )

As far as i know it does the infills by virtually changeing the nozzle diameter and with it the extrusion width.
I shortly examined a gcode and saw that for the single extrusions there are "tool-switches" from one to an other with different diameters...

[slaughter2k]

BANG --> I will check that directly when arriving home.
My problem: I am printing with a Y-piece and am switching tools with a tool change script. Maybe this screws up the single extrusion feature.
If this is the case I do hopefully find a workaround...

[slaughter2k]

ok...just started a simple geometry. It's working fine with single extrusion which is smaller than standard width (see pictures)
--> I try to get out where the difference to my "real" model is. It seems that he tries to realize a single extrude which is bigger than one standard width

single extrusion success_gcode.jpg (43.78 KiB) Viewed 4784 times

[rrdavis]

I shortly examined a gcode and saw that for the single extrusions there are "tool-switches" from one to an other with different diameters...

It isn't an actual tool change command. It just changes the E-values for how much plastic will be extruded. So even if you are using a custom tool change script, this won't affect you.