What's up with Benchy?

  • Having some issues printing Benchy on my Delta Mixer and not sure where they're coming from. Basically, the front of the boat is suffering from what looks like over extrusion or possibly lifting of the material. I've rotated the model in several directions and I've resized it by 125% and the issues persist. I've also tried switching between all three filaments independently as well as mixed. I'm using Slicer Prusa Edition v1.37.2. I believe it's a problem in Slicer or in the Duet firmware at this point. The sliced g-code looks good in Repetier before I save to a file for uploading. I'm using a Duet WiFi with 1.20beta2.

    Anyone else able to verify?


  • Photos would be helpful.

  • What's the best way to do that here since I can't upload directly to the site?

  • administrators

    Upload the phots to an image hosting service (imjur for example) then link them in the image tags

  • That is the trick with the Benchy. Need tons of cooling on the front side to keep it from peeling up. That is how I learned that ABS does like a part cooling fan when being used with an enclosed printer.

  • That's the briding on the Front. That is a little overhang. Do you print with a Layer Fan enabled or without?

    What's your Jerk, Acceleration and Speed-Settings, cause all of them will have an impact to this.

    I'm struggling (without a Fan) to similar issues

  • Not able to get photos posted due to security with our firewall. I let the print finish at 125% size and the issue corrects itself around a 1/2" up from the bottom. It's all smooth and good from there. I have pics I'll try to post later this weekend of what the problem looks like. At 100% it's much more pronounced. I am not using a layer fan.

    Here's my config.h:

    ; Think3DPrint3D configuration file for Mini Kossel for testing Duet WiFi

    ; Communication and general
    M111 S0
    M550 PRostock x301
    M551 Preprap
    M540 P0xBE:0xEF:0xDE:0xAD:0xFE:0xED
    M552 S1

    M555 P2
    M575 P1 B115200 S1

    G21 ; Work in millimetres
    G90 ; Send absolute coordinates…
    M83 ; ...but relative extruder moves

    ; Axis and motor configuration
    M569 P0 S0 ; Drive 0 goes forwards
    M569 P1 S0 ; Drive 1 goes forwards
    M569 P2 S0 ; Drive 2 goes forwards
    M569 P3 S0 ; Drive 3 goes forwards
    M569 P4 S0 ; Drive 4 goes forwards
    M569 P5 S1 ; Drive 5 goes backwards
    M574 X2 Y2 Z2 S1 ; set endstop configuration (all endstops at high end, active high)

    M665 L205.920 R94.327 H224.16 B105 X-1.246 Y-0.106 Z0.000 ; set delta radius, diagonal rod length, printable radius and homed height
    M666 X0.48 Y-0.39 Z-0.09 ; put your endstop adjustments here, or let auto calibration find them

    M208 S1 Z-2.00 ; set minimum Z

    M350 X16 Y16 E16 I1 ; Set 16x microstepping with interpolation
    M92 X80 Y80 Z80 ; Set axis steps/mm
    M906 X1000 Y1000 Z1000 E800 I60 ; Set motor currents (mA) and increase idle current to 60%
    M201 X1000 Y1000 Z1000 E1000 ; Accelerations (mm/s^2)
    M203 X20000 Y20000 Z20000 E3600 ; Maximum speeds (mm/min)
    M566 X1200 Y1200 Z1200 E1200 ; Maximum instant speed changes mm/minute
    M579 X1.02 Y1.02 Z1.00 ; Adjust scale of X, Y, and Z axis to calibrate printer

    ; Thermistors
    M305 P0 T100000 B3950 R4700 H30 L0 ; Put your own H and/or L values here to set the bed thermistor ADC correction
    M305 P1 T100000 B3950 R4700 H30 L0 ; Put your own H and/or L values here to set the first nozzle thermistor ADC correction

    ; Heater Model Parameters
    M307 H0 A80.7 C40.8 D1.4 S1.00 B0 ; Heated Bed
    M307 H1 A229.4 C185.6 D9.5 S1.00 B0 ; Hot End
    M307 H2 A340.0 C140.0 D5.5 S1.00 B0
    M307 H3 A340.0 C140.0 D5.5 S1.00 B0
    M307 H5 A340.0 C140.0 D5.5 S1.00 B0
    M307 H6 A340.0 C140.0 D5.5 S1.00 B0
    M307 H7 A340.0 C140.0 D5.5 S1.00 B0

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

    ; Tool definitions

    M92 E98.0:98.0:98.0 ; Set extruder steps per mm
    M207 S3.00 F3000 ; Set firmware retraction

    M563 P0 D0:1:2 H1 ; Define tool 0
    G10 P0 X0 Y0 ; Set tool 0 axis offsets
    G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C
    M567 P0 E0.90:0.05:0.05 ; Set mixing ratios for tool 0 (90%,5%,5%)
    M563 P1 D0:1:2 H1 ; Define tool 1
    G10 P1 X0 Y0 ; Set tool 1 axis offsets
    G10 P1 R0 S0 ; Set initial tool 1 active and standby temperatures to 0C
    M567 P1 E0.05:0.90:0.05 ; Set mixing ratios for tool 1 (5%,90%,5%)
    M563 P2 D0:1:2 H1 ; Define tool 2
    G10 P2 X0 Y0 ; Set tool 2 axis offsets
    G10 P2 R0 S0 ; Set initial tool 2 active and standby temperatures to 0C
    M567 P2 E0.05:0.05:0.90 ; Set mixing ratios for tool 2 (5%,5%,90%)
    M563 P3 D0:1:2 H1 ; Define tool 3
    G10 P3 X0 Y0 ; Set tool 3 axis offsets
    G10 P3 R0 S0 ; Set initial tool 3 active and standby temperatures to 0C
    M567 P3 E0.34:0.33:0.33 ; Set mixing ratios for tool 3 (34%,33%,33%)

    T3 ; select tool 3 (evenly mixed)

    ; Z probe and compensation definition
    M558 P5 X0 Y0 Z0 H3 F200 T6000 ; Z probe is a BLTouch probe and is not used for homing any axes
    G31 X0 Y45.5 Z1.2 P50 ; Set the zprobe height and threshold (Higher value LOWER nozzle height, Lower value RAISE nozzle height)
    M307 H4 A-1 C-1 D-1 ; Disable heater 4 for BLTouch to use E3Heat PWM for servo control.
    M557 R75 S20 ; Mesh Bed Leveling

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

  • Values seems to be okay to me.

    Anyhow, without a Layer Fan it's quite hard to get a fine finish on the Front.

    Is there no option for a fan?


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