Very stubborn print quality issue

[rjenkinsgb]

Are the config files identical between the machines?

Any chance of a typo in this one, like the extruder being in bang-bang mode?

Have you tried the hotend thermistor, as I suggested at the start of the thread?

[Vinculum]

@rjenkinsgb

M584 X0.4 Y0.5 Z0.0:0.1:0.2:0.3 E1.0 ; set drive mapping
M350 X256 Y256 Z64 E32 I0 ; configure microstepping without interpolation
M92 X800.00 Y800.00 Z12820.00 E1402.00 ; set steps per mm
M566 X900.00 Y900.00 Z150.00 E900.00 ; set maximum instantaneous speed changes (mm/min)
M203 X30000 Y30000 Z300 E12000 ; set maximum speeds (mm/min)
M201 X2000 Y2000 Z150 E1500 ; set accelerations (mm/s^2)
M906 X2000 Y2000 Z2000 E500 I50 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

;Hotend 1
M308 S1 P"1.temp0" Y"thermistor" T100000 B4725 C7.06e-8 ; configure sensor 1 as thermistor on pin 1.temp0
M950 H1 C"1.out0" T1 ; create nozzle heater output on 1.out0 and map it to sensor 1
M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
M143 H1 S280 ; set temperature limit for heater 1 to 280C

[Vinculum]

Ok so new update.
Swapped the Sherpa extruder for a brand new orbiter, changed the steps/mm etc accordingly.
No change.

Tried 3rd roll of filament that came from another printer that printed fine with it.
No change.

Unrolled a couple of meters of filament to eliminate the spoolholder.
No change.

It is something that changes based on a certain amount of extruded filament but it is not the extruder...

[rjenkinsgb]

@hbm-3d said in Very stubborn print quality issue:

Swapped the Sherpa extruder for a brand new orbiter, changed the steps/mm etc accordingly.
No change.

Was that the extruder only, or the complete hot end system?
(I'm not familiar with those particular extruders).

[Falkia]

How does the temperature graph for the hotend look, is the temperature reading stable?
Have you tried another hotend/thermistor/heat element?

[engikeneer]

@hbm-3d said in Very stubborn print quality issue:

It is something that changes based on a certain amount of extruded filament but it is not the extruder...

Is it time or filament length based? Maybe do a couple of single wall prints the same size with different wall thicknesses to check

[theruttmeister]

@hbm-3d change between relative/absolute values for E. See if that does anything. You'll need to change in both RRF and slicer.

[hackinistrator]

i'm 90% sure its your bed heat cycle .
try to print without heating the bed .

[Vinculum]

@hackinistrator
You dir sir are my hero of the day. Turned the bed heater off after the first layer et voila:

So i checked the config with the other printers. It is not completely the same (others are Duet 2 with RRF2) but i missed 1 tiny thing.
This line: M307 H0 B1 S1.00
The B1 had to be a B0...

Problem solved, case closed. I thank you all for your time and input!