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Adjusting e-steps


golddustpeak
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After replacing the bearings in my (Voron 2.4 built this January) extruder a while ago I decided to look at the calibration again.

 

Starting with the suggested 22.6789511 I extruded about 85mm when trying for 100mm.  I've slowly worked myself down to 17.5 and I seem to be stuck extruding 90mm of filament when trying for 100mm with little change between rotation_distance numbers tried.

Below is the segment from my printer.cfg file.

##  Update value below when you perform extruder calibration
##  If you ask for 100mm of filament, but in reality it is 98mm:
##  rotation_distance = <previous_rotation_distance> * <actual_extrude_distance> / 100
##  22.6789511 is a good starting point
rotation_distance: 17.5   #Bondtech 5mm Drive Gears
##  Update Gear Ratio depending on your Extruder Type
##  Use 50:17 for Afterburner/Clockwork (BMG Gear Ratio)
##  Use 80:20 for M4, M3.1
gear_ratio: 50:17               #BMG Gear Ratio
microsteps: 32
full_steps_per_rotation: 200    #200 for 1.8 degree, 400 for 0.9 degree
nozzle_diameter: 0.400
filament_diameter: 1.70

 

Any thoughts as to what is going on?

as always thanks for the help.

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17 hours ago, golddustpeak said:

Afterburner / BMG as shown in the manual(s).

Thats Clockwork 1 

Is it constant? make sure its not slipping, extrude 3 times and see if there are differences, even if its 1mm difference there is slipping.

You can add some resistance to test with your fingers on the filament jsut to feel if it starts slipping.

Are you using the default motor (the square NEma pancake?) cause your numbers are off...

Whats the run_current of the motor?

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4 hours ago, Buurman said:

Are you using the default motor (the square NEma pancake?) cause your numbers are off...

Whats the run_current of the motor?

Yes I have a Moons NEMA 17 17HS08-1004S on the extruder.

I'm sure that the numbers are off as that is why I'm looking for help 🙂

As to the current  I really have no way to measure it at this time.

I'll do some more extruding and report back later.

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48 minutes ago, claudermilk said:

For the current, what @Buurman is asking is what is the setting in your printer.cfg file? That's the run_current line. A good starting point would be about 0.5 for that stepper (1.0A max).

##  E0 on MOTOR6
##  Make sure to update below for your relevant driver (2208 or 2209)
[tmc2209 extruder]
uart_pin: PE1
interpolate: false
run_current: 0.5
sense_resistor: 0.110
stealthchop_threshold: 0

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OK so today I've been a lot more careful with my filament measuring.

Today with Wednesdays filament  I made 5 runs attempting to extrude 100mm not in order:

89mm, 90mm, 90mm, 91mm and 92mm

Then needing to change filament anyways (color only not brand) I attempted ti extrude 100mm again for 3 runs:

83mm, 85mm and 88mm

I ran some separate tests varying the tension. as the tension increased extruder began to skip and I found the best results with the least amount of tension and no skipping.

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