Extruder calibration

antoine.voiry

All,
I am trying to calibrate the E step for my extruder but I am failing.
My extruder is as follow
http://shop.bondtech.se/ec/extruders/bondtech-qr-30-universal.html

The issue, when I try to calibrate the extruder, if I try to extrude 10mm, it seems ok, same for 20mm, now if I try to calibrate 50mm, I extrude 30, if I adjust the step/mm, I still get 30mm.

I have tried to clean the extruder hobs but nothing seems to be fixing the issue.

[[language]]
; Configuration file for MendelMax

; Communication and general
M111 S0                             	; Debug off
M550 p3steel		; Machine name and Netbios name (can be anything you like)
M551 Preprap                        	; Machine password (used for FTP)
;*** If you have more than one Duet on your network, they must all have different MAC addresses, so change the last digits
M540 P0xBE:0xEF:0xDE:0xAD:0xFE:0xED 	; MAC Address
;*** Wifi Networking
M552 S1				; Enable WiFi

; misc settings
M555 P2                           	; Set output to look like Marlin
M575 P1 B57600 S1			; Comms parameters for PanelDue

; setting for all axis
G21                                 	; Work in millimetres
G90                                	; Send absolute coordinates...
M83                                 	; ...but relative extruder moves

; Axis and motor configuration
M569 P0 S0				; Drive 0 goes forwards (x)
M569 P1 S1				; Drive 1 goes forwards (Y)
M569 P2 S1				; Drive 2 goes forwards (z)
M569 P3 S0				; Drive 3 goes forwards (e1)
M569 P4 S1				; Drive 4 goes forwards (E2)

; microstepping and homing switch config
M350 X16 Y16 Z16 E16 I1             ; set 16x microstepping with interpolation

M574 X1 S0		    ; set homing switch configuration (X homing switch only, at low end, active high)
M574 Y1 S0		    ; set homing switch configuration (Y homing switch only, at low end, active high)
M574 Z0 S1		    ; set homing switch configuration (z homing switch only, at low end, active high)

; Motor current and acceleration
M906 X800 Y1000 Z800 E1400 I60		; Set motor currents (mA) and increase idle current to 60%
M84 S60 ; Set idle timeout

M201 X800 Y800 Z15 E800		; Accelerations (mm/s^2)
M203 X4000 Y4000 Z240 E3600		; Maximum speeds (mm/min)
M566 X1500 Y1500 Z120 E20		; Maximum instant speed changes mm/minute

; steps per mm
M92 X80 Y80 Z4000  ; Set axis steps/mm
M92 E493                          ; set extruder 0 and 1 steps/mm

; max travel and origin
M208 X214 Y310 Z200 

; Thermistors
M143 S270 ; Set maximum heater temperature to 260C
M305 P0 R4700 T100000 B4388   ; set bed thermistor parameters
M305 P1 R4700 T100000 B4388   ; set E0 thermistor parameters
M307 H1 A474.7 C114.3 D5.5 B0; PID settings for extruder 0

M570 S180				; Hot end may be a little slow to heat up so allow it 180 seconds

; Fans
M106 P1 H-1 				; disable thermostatic mode for fan 1

; Tool definitions
M563 P0 D0 H1                       	; Define tool 0
G10 P0 S0 R0                        	; Set tool 0 operating and standby temperatures

; Z probe and compensation definition
M558 P1 X0 Y0 Z1 H3 F600 T5000    ; smart IR Z probe, used for homing Z axis only, dive height 3mm, probe speed 200mm/min, travel speed 5000mm/min
G31 P500 X0 Y25 Z1.30        ; set threshold and offsets (we were at 0.74 )

;*** If you are using axis compensation, put the figures in the following command
M556 S78 X0 Y0 Z0                   	; Axis compensation here

M208 X0 Y0 Z0 S1 				; set minimum Z
;
T0					; select first hot end

; Miscellaneous
M501 ; Load saved parameters from non-volatile memory

dc42

What speed are you running the extruder at when you do the calibration? Is the extruder drive connected to the hot end, or not?

antoine.voiry

@dc42:

What speed are you running the extruder at when you do the calibration? Is the extruder drive connected to the hot end, or not?

hello,
I have tried 5, 10 and 15 i n UI.
Interesting enough, the issue doesn't seem to be present when using the GCODE CONSOLE.
Antoine

dc42

When you use the gcode console, what speed were you using?

Most extruder drives can't extrude through a 0.4mm at much more than 5mm/sec.

antoine.voiry

Hello,
I am using F300 which is I think 5mm/sec.

Antoine

deckingman

Lots of possible reasons for this. The best way to start IMO is to disconnect the extruder from the hot end and extrude something like 100mm of filament and measure what you actually get, then adjust the steps per mm accordingly. It should be in the region of 492.45 steps per mm according to the link. Then reconnect the hot end and try again at a low speed. If you get significantly less, then it's something to do with pushing filament through the hot end and not the extruder steps per mm. Maybe skipping steps or grinding filament because of a partial blockage, or motor current set too low, or hot end temperature too low for the filament etc.