Tuning Hypercube Evolution Extrusion quality



  • Hi guys,
    I built an Hypercube Evolution controlled by a Duet Wifi, it includes:

    • 24V Power Supply
    • Duet Wifi + PanelDue 5"
    • Titan Extruder + E3D V6 Hotend (Bowden)
    • 5 x Nema 17HS4401S stepper
    • Raspberry Pi 3 + Camera
    • 24V 5050 Led

    Some photos of the printers:
    0_1537258899706_IMG_20180913_002303.jpg
    0_1537258909169_IMG_20180913_002330.jpg

    Almost everything is working... but not the quality of the extrusion:
    0_1537258948721_IMG_20180918_101241.jpg

    As you can see, there are some blob on the retraction point, tt seems that the retraction is too slow and produce these blob at the beginning and at the end of the loop.

    I'm using Simplify3D and I use 5mm of retraction at 50mm/s. Coasting, Extra restart distance, Pressure Advance don't produce any change of the quality, the problems remains.

    My Duet configuration is:

    ; Configuration file for Duet WiFi (firmware version 1.20 or newer)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool on Tue Jun 19 2018 17:45:27 GMT+0200 (CEST)
    
    ; General preferences
    G90                                ; Send absolute coordinates...
    M83                                ; ...but relative extruder moves
    M555 P2                            ; Set firmware compatibility to look like Marlin
    
    M667 S1                            ; Select CoreXY mode
    
    ; Network
    M550 PDuetWifi                     ; Set machine name
    M552 S1                            ; Enable network
    M587 S"Brisma-WiFi" P"Brisma-WiFi" ; Configure access point. You can delete this line once connected
    M586 P0 S1                         ; Enable HTTP
    M586 P1 S0                         ; Disable FTP
    M586 P2 S0                         ; Disable Telnet
    
    ; Drives
    M569 P0 S1 F7                         ; Drive 0 goes forwards
    M569 P1 S1 F4                         ; Drive 1 goes forwards
    M569 P2 S1 F1                         ; Drive 2 goes forwards
    M569 P3 S0                            ; Drive 3 goes backwards
    M569 P4 S0                            ; Drive 4 goes backwards
    M350 X16 Y16 Z16 E16:16 I1            ; Configure microstepping with interpolation
    M92 X80 Y80 Z400 E430:418.5           ; Set steps per mm
    M566 X600 Y600 Z12 E300:300           ; Set maximum instantaneous speed changes (mm/min)
    M203 X18000 Y18000 Z600 E9000:9000    ; Set maximum speeds (mm/min)
    M201 X3000 Y3000 Z250 E3000:3000      ; Set accelerations (mm/s^2)
    M906 X1200 Y1200 Z1200 E1200:1200 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30                               ; Set idle timeout
    
    ; Axis Limits
    M208 X0 Y10 Z0 S1                  ; Set axis minima
    M208 X300 Y300 Z350 S0             ; Set axis maxima
    
    ; Endstops
    M574 X2 Y2 S1                      ; Set active high endstops
    
    ; Z-Probe
    M574 Z1 S2                         ; Set endstops controlled by probe
    M307 H3 A-1 C-1 D-1                ; Disable heater on PWM channel for BLTouch
    M558 P9 H3 F300 T9000              ; Set Z probe type to bltouch and the dive height + speeds
    G31 P25 X20 Y0 Z1.00               ; Set Z probe trigger value, offset and trigger height
    M557 X20:280 Y20:280 S40           ; Define mesh grid
    
    ; Heaters
    M307 H0 B0 S1.00                   ; Disable bang-bang mode for the bed heater and set PWM limit
    M305 P0 T100000 B3950 R4700        ; Set thermistor + ADC parameters for heater 0
    M143 H0 S110                       ; Set temperature limit for heater 0 to 110C
    M305 P1 T100000 B3950 R4700        ; Set thermistor + ADC parameters for heater 1
    M143 H1 S240                       ; Set temperature limit for heater 1 to 240C
    
    ; Fans
    M106 P0 S0 I0 F500 H-1             ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P1 S0.45 I0 F25000 H-1        ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P2 S0.10 I0 F500 H-1          ; Set fan 2 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
    M563 P1 D1 H1                      ; Define tool 1
    G10 P1 X0 Y0 Z0                    ; Set tool 1 axis offsets
    G10 P1 R0 S0                       ; Set initial tool 1 active and standby temperatures to 0C
    
    ; Automatic power saving
    M911 S21 R23 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss
    
    ; Miscellaneous
    M404 N1.75 D0.4	                                   ; Filament width and nozzle diameter
    M376 H10                                           ; Set bed compensation to taper off over 10mm
    M501                                               ; Load saved parameters from non-volatile memory
    T0                                                 ; Select first tool
    M572 D0:1 S0.10                                    ; Pressure advance
    
    

    How can I optimize my configuration?



  • There will always be some sort of layer seam. How you deal with it will vary for each model. Sometimes it can be hidden inside sharp corners but on rounded smooth models it can be best to force it to the back side of the model or to align it somewhere. That keeps most of the surface completly fine and leaves a single vertical seam hopefully somewhere that doesn't matter.

    Then to reduce the actual size of the seam will be a bit trickier. Simplify 3d has coasting and all sorts of other things which honestly seem to make it worse. Coasting will also interfere with pressure advance which is a better solution anyway.

    How long is your Bowden tube? You may need quite a bit of pressure advance.



  • Your extruder speeds are a little slow. You could probably get some improvement by letting it retract faster. I'd double all your current values for extruder jerk, acceleration, max speed and retraction speed and try again. Leave unretraction speed slower.

    Also make sure your z speeds are fast enough that it isn't pausing on layer change.



  • @phaedrux
    Thanks 🙂

    Then, I will try changing my configuration with these new settings:

    M566 X600 Y600 Z120 E900:900          ; Set maximum instantaneous speed changes (mm/min)
    M203 X18000 Y18000 Z600 E18000:18000  ; Set maximum speeds (mm/min)
    M201 X3000 Y3000 Z250 E6000:6000      ; Set accelerations (mm/s^2)
    
    M572 D0:1 S0.20                                    ; Pressure advance
    

    Correct?


 

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