Perimeter Seam. Why stops hotend on end and/or start



  • Duet Wifi
    Tronxy X5SA 400x400mm
    bowden drived Hotend (BigBooster H2O)
    S3D

    I have problems long time with blobs on start and or stop on each periemter.
    It results in visible and touchable seam on outershell.

    I tried nearly all combinations ( 😉 ) of retraction, restartretraction, coasting, etc... combined with diffenrent sets of linear compreassion. Printed a lot test "towers".

    I noted the "best" seam result on layers with NO retraction (all retraction settings disabled).

    I noted that activating any retraction settings (even just coasting activated) result in short stops from the hotend at start and especially at the end of perimeter. in this time the blobs are created.

    That's the reason why the prints with no retraction result in better outlines - better seam.

    Since the seam ist still far away from perfect, i would like to pimp them with the retraction settings. Unfortunately, these settings make the result worse as i tried to describe above.

    The one solution i could imagine is to accelerate the extruder. But i think my speed settings in config should be fast enought - if not even to fast.
    Or is the Z to slow maybe?

    M201 X2500 Y2500 Z3000 E3000 ; set accelerations (mm/s^2)
    M203 X24000 Y24000 Z3000 E6000 ; set maximum speeds (mm/min)
    M566 X550 Y500 Z1000 E1000 ; Jerk (mm/min)

    Some good ideas?



  • print your config.

    maybe you forgot to configure your thermistors correctly and are printing at the wrong temperature.



  • thx i will do immediately.
    pls dont blame me about my confused config



  • ; Configuration file for Duet WiFi (firmware version 3)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.8 on Fri Jan 17 2020 14:46:51 GMT+0100 (Mitteleuropäische Normalzeit)

    ; General preferences
    G90 ; send absolute coordinates...
    M83 ; ...but relative extruder moves
    M550 P"Tronxy" ; set printer name

    M667 S1 ; select CoreXY mode

    ; Network
    M552 S1 ; enable network
    M586 P0 S1 ; enable HTTP
    M586 P1 S1 ; enable FTP
    M586 P2 S1 ; enable Telnet

    ; Drives
    M569 P0 S0 ; physical drive 0 goes backwards
    M569 P1 S0 ; physical drive 1 goes backwards
    M569 P2 S1 ; physical drive 2 goes forwards Z1
    M569 P3 S0 ; physical drive 3 goes backwards
    M569 P4 S1 ; physical drive 3 goes forwards Z2

    ; DUAL Z
    M584 X0 Y1 Z2:4 E3 ; set drive mapping ;M584 X0 Y1 Z2 E3
    M671 X-90:490 Y200:200 S4 ; leadscrews at left (connected to Z) and right (connected to E1) of X axis

    M350 X64 Y64 Z64 E64 I1 ; configure microstepping with interpolation
    ;M92 X323.835 Y320 Z1606.522 E1582 ; set steps per mm
    M92 X322.381 Y320.320 Z1606.522 E1582 ; set steps per mm

    M201 X2500 Y2500 Z3000 E3000 ; set accelerations (mm/s^2)
    M203 X24000 Y24000 Z3000 E6000 ; set maximum speeds (mm/min)
    M566 X550 Y500 Z1000 E1000 ; Jerk (mm/min)
    M572 D0 S0.5

    M906 X1100 Y1100 Z1000 E1200 I35 ; set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    ; Axis Limits
    M208 X-7 Y-14 Z0 S1 ; set axis minima
    M208 X400 Y360 Z390 S0 ; set axis maxima

    ; Endstops
    M574 X1 S1 P"!xstop" ; configure active-low endstop for low end on X via pin xstop
    M574 Y1 S1 P"!ystop" ; configure active-low endstop for low end on Y via pin ystop
    M574 Z1 S2 ; configure Z-probe endstop for low end on Z

    ; Filament sensor
    M591 P1 C"e0_stop" S1 ;

    ; Z-Probe

    M558 P8 C"zprobe.in+zprobe.mod" H2 F2000 T12000 S0.04 I1 ; set Z probe type to unmodulated and the dive height + speeds
    G31 P500 X-30 Y5 ; set Z probe trigger value, offset and trigger height Z WERT in homeZ.conf
    ;M556 S50 X0 Y0 Z0 ; set orthogonal axis compensation parameters
    ;M557 X52:350 Y30:350 S20 ; define mesh grid

    ; Heaters
    M308 S0 P"bedtemp" Y"thermistor" T102400 B4138 ; configure sensor 0 as thermistor on pin bedtemp
    M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0
    M143 H0 S120 ; set temperature limit for heater 0 to 120C
    M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
    M307 H0 A106.4 C953.3 D2.2 V24.1
    M140 S65 R40;

    M140 H0 ; map heated bed to heater 0

    M308 S1 P"e0temp" Y"thermistor" T100000 B4725 C7.06e-8 ; configure sensor 1 as thermistor on pin e0temp
    M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1
    M143 H1 S280 ; set temperature limit for heater 1 to 280C
    M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
    M307 H1 A1170.9 C396.6 D5.8 V24.1

    ; Fans
    M950 F0 C"fan0" Q400 ; create fan 0 on pin fan0 and set its frequency
    M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
    M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency
    M106 P1 S1 H1 T45 ; set fan 1 value. Thermostatic control is turned on

    ; Tools
    M563 P0 D0 H1 F0:1 ; define tool 0
    G10 P0 X0 Y0 Z0 ; set tool 0 axis offsets
    G10 P0 R180 S200 ; set initial tool 0 active and standby temperatures to 0C

    ; Custom settings
    ;Tappering
    M376 H10 ; Bettkompensation läuft über 10mm Linear aus

    M501;


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