Underextrusion at the Beginning of Print Moves

GaRv3 · 18 Jun 2018, 14:56

; Configuration file for Duet WiFi (firmware version 1.20 or newer)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool on Fri Feb 02 2018 20:19:38 GMT+0100

; General preferences
M111 S0 ; Debugging off
G21 ; Work in millimetres
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M555 P2 ; Set firmware compatibility to look like Marlin
; Automatic saving after power loss is not enabled

M667 S0 ; Select CoreXY mode: Cartesian
M208 X-45 Y-15 Z0 U0 V0 S1 ; Set axis minima
M208 X215 Y210 Z230 U230 V230 S0 ; Set axis maxima

; Endstops
M574 X1 Y1 Z1 U1 V1 S1 ; Set active high endstops
M558 P4 B1 H4 F120 T6000 I1 ; Set Z probe type to switch and the dive height + speeds (inversed)
G31 P600 X-26 Y-40 Z2.700 ; Set Z probe trigger value, offset and trigger height
M557 X40:160 Y40:160 S40 ; Define mesh grid

; Map Drives
M584 X0 Y1 Z2:4 U2 V4 E3 ; X:0, Y:1, Z:2+4, E:3, U(Z1):2, V(Z2):4

;Stall Detection
M915 X S23 F0 R1 ; Stall detection for X axis
M915 Y S23 F0 R1 ; Stall detection for Y axis
M915 Z S-10 F0 R1 ; Stall detection for Z axis
M915 U S-10 F0 R1 ; Stall detection for Z axis 1 (U)
M915 V S-10 F0 R1 ; Stall detection for Z axis 2 (V)

; Drives
M569 P0 S1 ; Drive 0 (X) goes forwards
M569 P1 S1 ; Drive 1 (Y) goes forwards
M569 P2 S0 ; Drive 2 (Z1/U) goes backwards
M569 P3 S1 ; Drive 3 (E) goes forwards
M569 P4 S0 ; Drive 4 (Z2/V) goes backwards

M350 X16 Y16 Z16 U16 V16 E16 I1 ; Configure microstepping (interpolated)
M92 X100 Y100 Z400 U400 V400 E100 ; Set steps per mm (interpoloated)
M566 X600 Y600 Z18 U18 V18 E300 ; Set maximum instantaneous speed changes (mm/min) (Jerk) (A8 Default)
M201 X2000 Y2000 Z100 U100 V100 E10000 ; Set MAX accelerations (mm/s^2) (A8 Default)
M203 X24000 Y24000 Z480 U480 V480 E3000 ; Set maximum speeds (feedrate) (mm/min) (A8 Default)
M204 P400 T1000 ; Set accelerations for print and travel moves (mm/s^2)
M906 X900 Y900 Z900 U900 V900 E900 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S60 ; Set idle timeout

; Pressure Advance
;M572 D0 S0.010 ; Set pressure advance

; Firmware Retraction
;M207 S4.0 F2400 Z0.04 ; Set retraction distance (mm), speed (mm/min) and Z-Hop

; Heaters
;M301 H0 S1.00 P10 I0.1 D200 T0.4 W180 B30 ; Use PID on bed heater (may require further tuning)
M305 P0 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S120 ; Set temperature limit for heater 0 to 120C
M305 P1 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C

; Tools
M563 P0 D0 H1 ; Define tool 0
G10 P0 X0 Y0 Z0 U0 V0 ; Set tool 0 axis offsets
G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C

; Network
M550 PAnet A8 Test ; Set machine name
;M551 Pxxx ; Set password
M552 S1 ; Enable network
M587 S"xxx" P"xxx" I192.168.0.70 ; Configure access point.
M586 P0 S1 ; Enable HTTP
M586 P1 S1 ; Enable FTP
M586 P2 S0 ; Disable Telnet

; Fans
M106 P0 S0 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H1 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P2 S1 I0 F500 H1 T45 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

; CPU Temperature Calibration
M912 P0 S-16.5

; Load saved Settings
M501 ; Load config-override.g

GaRv3 · 19 Jun 2018, 18:51

It seems linke the extruder starts extruding filament a little too late.
Nobody else faced this problem before?

Phaedrux · 19 Jun 2018, 19:02

Try setting your motor current to 85% of max minimum and retry.

Phaedrux · 19 Jun 2018, 19:16

@phaedrux what is the extruder?

It totally goes away if you revert to a previous firmware version?

GaRv3 · 20 Jun 2018, 08:56

The motor runs at 900mA which is the current it is rated at.
I have not tried reverting to an older firmware version. I am not sure how to do this safely.

Danal · 20 Jun 2018, 14:15

@garv3 said in Underextrusion at the Beginning of Print Moves:

I am not sure how to do this safely.

Get whatever version you wish from Github. Follow the normal upload, etc. Depending on exact versions, slight tweaks to configuration may be needed.

If you somehow get "painted into a corner", follow the fallback procedures here:

https://duet3d.dozuki.com/Wiki/Installing_and_Updating_Firmware

Fallback #3 will ALWAYS work, and can be used to install any release after 1.19. In fact, if you have doubt about "mixed versions" or similar, starting with a blank/formatted card and fallback #3 will ensure everything is in sync. I've done it before, just for "mental comfort".

Phaedrux · 20 Jun 2018, 16:25

900ma seems low to me for rated current. Can you post a link to the motor specs?

GaRv3 · 20 Jun 2018, 23:36

https://www.gearbest.com/3d-printer-parts/pp_540282.html?vip=4266359&gclid=CjwKCAjw9qfZBRA5EiwAiq0AbXsG7eVHXuESAoNW6fhbcCEcmuNcOI2yTYnp016b9ylPt-luT8IzGhoC6pwQAvD_BwE

Phaedrux · 21 Jun 2018, 17:45

Main Features:

Step angle: 1.8 degree

Number of phases: 2

Voltage: 3.96V

Current: 0.9A

Resistance: 4.4 ohm

Holding torque: 0.34 Nm

In this case 900mA might be too high for this motor, try 765 instead which would be 85% of rated.

Running the motor at max current could explain the behaviour seen here if it's overheating. Does the motor feel hot to the touch?

GaRv3 · 21 Jun 2018, 18:44

During long prints they get warm but not really hot. I set them to 765mA now.

GaRv3 · 21 Jun 2018, 22:30

Lowering the current unfortunately didn't change anything.

Phaedrux · 21 Jun 2018, 22:44

Can you post some pictures of your slicer settings?

Phaedrux · 21 Jun 2018, 22:46

Also, what type of extruder is it? 4mm of retraction may be too much. It really looks like retraction under runs.