Changing Flow Rate or Filament Diameter Doesn't Change Anything

Hi all,

Marlin currently is driving me crazy. Starting with the update to 1.1.7 my flowrate was by far to high. I had to set filament diameter to 2.5 to print properly using 1.75mm filament. Currently I am using 1.1.8 and still have problems with massive over extrusion. Hence, I reduced the filament diameter in Marlin (of course volumetric settings) from 2.75 to 2mm in 0.2mm steps using LCD and store settings. This had NO effect at all. Hence, I started reducing flowrate from 1 to 0.75 in Octoprint (I checked on LCD during print). This again had NO effect at all.

What am I doing wrong?
Settings:
- Slic3r 1.3.0-dev. Printer settings -> Use Volumetric E ticked
- Marlin 1.1.8 Filament Volumetric Settings turned on

Send: M503
Recv: echo:  G21    ; Units in mm
Recv: echo:  M149 C ; Units in Celsius
Recv: Recv: echo:Filament settings:Recv: echo:  M200 D2.00
Recv: echo: Steps per unit:
Recv: echo:  M92 X80.00 Y80.00 Z2560.00 E365.30
Recv: echo:Maximum feedrates (units/s):
Recv: echo:  M203 X300.00 Y300.00 Z5.00 E25.00
Recv: echo:Maximum Acceleration (units/s2):
Recv: echo:  M201 X3000 Y3000 Z100 E10000
Recv: echo:Acceleration (units/s2): P R T
Recv: echo:  M204 P3000.00 R3000.00 T3000.00
Recv: echo:Advanced: S T B X Z E
Recv: echo:  M205 S0.00 T0.00 B20000 X20.00 Y20.00 Z0.40 E5.00
Recv: echo:Home offset:
Recv: echo:  M206 X0.00 Y0.00 Z0.00
Recv: echo :Auto Bed Leveling:
Recv: echo:  M420 S0Recv: echo:Material heatup parameters:
Recv: echo:  M145 S0 H180 B70 F0
Recv: echo:  M145 S1 H240 B110 F0
Recv: echo: PID settings:
Recv: echo:  M301 P26.78 I1.76 D102.01
Recv: echo:  M304 P192.39 I27.57 D335.70
Recv: echo:Z-Probe Offset (mm):
Recv: echo:  M851 Z-0.21

What type of extruder bowden or direct drive ?

Direct. Just curious: Why do you think this might be related to my problem?

Quote

echo: M92 X80.00 Y80.00 Z2560.00 E365.30

This shows E steps at 365.3 which seems very high for a direct drive extruder my mk8 extruder is set to 102

Try marking the fillament 100 and 200 mm above where it enters the extruder and then extrude 100mm (G1 E100 F500), then measure how much fillament has been drawn into the extruder, adjust E steps accordingly.

I of course have done that already. I successfully printed around 5kg of ABS using that printer and the current settings. My printer is not disfunctional, I want to tune it.

My problem is that I want to change the flow of material and none of the settings I use seems to have any effect.

I for sure have messed up something in the settings (you are right, my E- Steps are pretty high), but I don't have any idea where to search.

Thanks a lot obewan! You gave me the decisive hint! The reason for my problem was damned simple. My extruder was in saturation. Filament was slipping through all the time no metter how much the flow rate was. Hence, the extruded amount of filament didn't change, since it still was the maximum my extruder could generate!

Thanks again and all the best,

Markus