Extrusion Calibration

[MichaelOToole]

Can some one point me in the right direction?

Printed my first print and it very good if possibly a little under extruded on top layer.
To test the extruded length, I marked the filament 70 mm from top , extruded 50mm twice (as it did not get close to the mark) but even so, there was 12mm left between mark and top.
Basically, extruding 100mm only extruded 58mm so something is wrong...

Is this method still used and if so, where do I make corrections?

Thanks in advance...

UPDATED: Code corrected - Apr 07, 2024, 11:19:49

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# For: CAMBus EBB SB2209 (RP2240)
#####################################

[extruder]
step_pin: EBBCan:gpio18
dir_pin: EBBCan:gpio19
enable_pin: !EBBCan:gpio17

nozzle_diameter: 0.400
filament_diameter: 1.750
full_steps_per_rotation: 200    #200 for 1.8 degree, 400 for 0.9 degree

heater_pin: EBBCan:gpio7
sensor_type: EPCOS 100K B57560G104F
sensor_pin: EBBCan:gpio27

min_temp: 0
max_temp: 250

## Update Gear Ratio depending on your Extruder Type
## Use 50:10 for Stealthburner/Clockwork 2
## Use 50:17 for Afterburner/Clockwork (BMG Gear Ratio)
## Use 80:20 for M4, M3.1

gear_ratio: 50:10       #BMG Gear Ratio
rotation_distance: 21.5 #Bondtech 5mm Drive Gears
microsteps: 16

pressure_advance: 0.05
pressure_advance_smooth_time: 0.040

 

[Vorkosigan]

You are looking for rotation distance.

Extruder Calibration

Ellis’ Print Tuning Guide

ellis3dp.com

A couple of thoughts, I don't know what extruder or stepper you are using, but double check the gear ratio and the steps per rotation are correct.

 

[MichaelOToole]

I used the LDO kit.
The link looks like it might answer all my questions... thanks Vorkosigan

The linked reference contains the same information but somewhat clearer.
My main concern was, why is my correction value way more than usual, most are in the range of 10 to 20, mine appears to be way higher but yet, the print is actually not bad...
Well tomorrow will tell, I'm finished playing with it for today...

Updated my previous post with corrected settings...