Extrusion problems on anet a8

  • So i'm having some issues with my Anet A8 under extruding (I think).
    The top layer has these weird gaps between 2 lines. It didn't do this before I got a duet so i'm pretty sure its firmware or software related but I just can't figure out what it is.


    This is my config.g file:

    ; Configuration file for Duet WiFi (firmware version 1.20 or newer)
    ; executed by the firmware on start-up
    ; generated by RepRapFirmware Configuration Tool on Wed Jun 06 2018 12:53:11 GMT+0200 (W. Europe Daylight Time)
    ; General preferences
    G21 						; Work in millimetres
    G90                                       	; Send absolute coordinates...
    M83                                        	; ...but relative extruder moves
    M555 P2 				  	; Set firmware compatibility to look like Marlin
    ; Network
    M550 PMy printer                           	; Set machine name
    M552 S1                                    	; Enable network
    M586 P0 S1                                 	; Enable HTTP
    M586 P1 S0                                 	; Disable FTP
    M586 P2 S0                                 	; Disable Telnet
    ; Drives
    M569 P0 S1                                 	; Drive 0 goes forwards
    M569 P1 S1                                 	; Drive 1 goes forwards
    M569 P2 S0                                 	; Drive 2 goes backwards
    M569 P3 S1                                 	; Drive 3 goes forwards
    M350 X16 Y16 Z16 E16 I1                    	; Configure microstepping with interpolation
    M92 X100 Y100 Z1600 E95                		; Set steps per mm 
    M566 X1200 Y1200 Z4.5 E300                 	; Set maximum instantaneous speed changes (mm/min)
    M203 X24000 Y24000 Z120 E3000              	; Set maximum speeds (mm/min)
    M201 X1000 Y1000 Z100 E5000               	; Set accelerations (mm/s^2)
    M204 P400 T400                            	; Lower accelerations when printing though
    M906 X750 Y750 Z750 E750                   	; Set motor currents (mA)
    M84 S0                                     	; Disable motor idle current reduction
    ; Axis Limits
    M208 X-36 Y-8 Z0 S1                        	; Set axis minima
    M208 X230 Y219 Z230 S0                     	; Set axis maxima
    ; Endstops
    M574 X1 Y1 S0                              	; Set active low endstops
    ; Z-Probe
    M574 Z2 S2                                 	; Set endstops controlled by probe
    M558 P7 i1 H5 F120 T6000                   	; Set Z probe type to modulated and the dive height + speeds
    G31 P500 X-26 Y-40 Z0.625                    	; Set Z probe trigger value, offset and trigger height
    M557 X20:200 Y20:170 S20                   	; Define mesh grid
    ; Heaters
    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
    ; Fans
    M106 P0 S0 I0 F500 H-1                     	; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    ; Tools
    M563 P0 D0 H1                              	; Define tool 0
    G10 P0 X0 Y0 Z0                            	; Set tool 0 axis offsets
    G10 P0 R0 S0                               	; Set initial tool 0 active and standby temperatures to 0C
    M200 D1.75

    I did notice some clicking noise and inconsistent extrusion when extruding at higher speeds, while at lower speeds it extrudes fine.

    Any help would be appreciated ☺

  • as you mention clicking it could be a small blockage or you first layer is laying down to close to the bed

  • I already changed the heater block, nozzle and throat, and after that is still happens. So I don't think that's it.
    pretty sure my nozzle height is good.

  • Are you getting the correct amount of filament ie 100 requested, 100 sent?

    I have had to correct mm/s every time I have changed parts on the hot end.

    Have you tuned the heater? That will help ensure the heat value.

  • Moderator

    I am also converted from Anet A8. Most of it is replaced by now but the hotend and extruder are still MK8. I recently recalibrated my steps/mm and I had to increase them about 5%. I can see you still have the 95 steps/mm (probably from Marlin config). So it is worth to recalibrate this. I am now at 102 steps/mm with mine.

  • So i'm getting 100 mm of extrusion when extruding at very low speeds, when I move to higher speeds it extrudes between 10 and 20 mm of filament. I had the steps per mm at 105.2 before but I changed it back because I didn't know if it was correct or not.

  • Moderator

    @mrniceguy The steps will be correct if the amount of infill the the extruder pushes will be exactly three amount it was commanded to push.

    Usually you mark something like 120 or 150mm on the filament measured from the top of the extruder. Then you extrude 100mm at 1mm/s. When this is finished measure the distance between the top of the extruder and your mark. With the result you can adjust your steps.

    Your day that at higher speeds it does extruder much less. What do you consider higher speeds? The Anet Hotend will extruder significantly less already at 4 to 6mm/s.

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