E3D V6 Full / Titan / Bowden - 1.75 - jamming PLA and PETG

Discussion in 'E3D-v6 and Lite6' started by Webdad, Nov 13, 2017.

  1. Webdad

    Webdad Member

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    I've built a 300 x 300 x 300 D-Bot and I'm using an E3D V6 full with a Titan extruder. Build recently finished and I'm working on the tuning and calibration. I've gone through calibrating extruder, X, Y, and Z steps, everything checks out as far as I can tell.

    The problem I had (but never resolved) with PLA was jamming in the heat break, so I switched to PETG. Results are marginally better - definitely get a better first layer, but the PETG also apparently jams after less than 10 min of printing and the Titan starts clicking.

    I've tried:
    - bumping temperature up and down
    - reapplying thermal paste to the heatbreak
    - repositioning the fan
    - setting retraction to 0.8mm

    Here are some pictures of the setup:

    [​IMG]

    PTFE Tube is fully seated - this is a picture when I was taking apart the hotend:

    [​IMG]

    The most recent test was with PETG - print temp 250c, bed 70c. This first layer generally looks good until the filament stopped extruding and the Titan started clicking.

    [​IMG]

    General build is:

    "D-Bot Blue" D-Bot build 300 x 300 x 300
    Hotend: E3D V6 (full)
    Nozzle: 0.4mm
    Extruder: Titan
    Print Bed: Mic6 Aluminum (8 x 325 x 325)
    Print Bed Heater: Keenovo Silicone heater (120v, 750w)
    Controller: DuetWiFi (firmware 1.19)
    Steppers: 1.8 degree, 2.0 amp, 84 oz

    Leadscrews: 8mm x 400mm - single start, 2mm / turn - w/anti-backlash nuts
    Filament width: 1.75mm

    Slicer: Simplify3D
    Layer Height: 0.2mm
    Extrusion Multiplier: 1.0
    Extrusion width: 0.5mm

    Tuning To Date:
    • X, Y, Z steps / mm
    • Extruder steps / mm
    • Autotune PID Extruder
    • Autotune PID Bed
    • Pressure Advance: M572 D0 S0.1
    Here is the config.g from the firmware:

    ; Configuration file for Duet WiFi (firmware version 1.19)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool on Sun Oct 22 2017 14:48:43 GMT-0500 (Central Standard Time)

    ; 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

    M667 S1 ; Select CoreXY mode
    M208 X0 Y0 Z0 S1 ; Set axis minima
    M208 X296.5 Y295 Z298 S0 ; Set axis maxima

    ; Endstops
    M574 X1 Y2 Z1 S0 ; Define active low and unused microswitches
    M558 P0 X0 Y0 Z0 H5 F120 T6000 ; Set Z probe type to switch, the axes for which it is used and the probe + travel speeds
    G31 P600 X0 Y0 Z2.5 ; Set Z probe trigger value, offset and trigger height
    M557 X15:265 Y15:265 S20 ; Define mesh grid

    ; Drives
    M569 P0 S1 ; Drive 0 goes forwards
    M569 P1 S1 ; Drive 1 goes forwards
    M569 P2 S1 ; Drive 2 goes forwards
    M569 P3 S1 ; Drive 3 goes forwards
    M350 X16 Y16 Z16 E16 I0 ; Configure microstepping without interpolation
    M92 X100 Y100 Z1600 E400.97 ; Set steps per mm (estimate for Titan Extruder)
    M566 X900 Y900 Z12 E120 ; Set maximum instantaneous speed changes (mm/min)
    M203 X900000 Y900000 Z300 E1740 ; Set maximum speeds (mm/min)
    M201 X1500 Y1500 Z250 E259 ; Set accelerations (mm/s^2)
    M906 X1200 Y1200 Z1200 E1600 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    ; Heaters
    M143 S260 ; Set maximum heater temperature to 260C
    M301 H0 S1.00 P10 I0.1 D200 T0.4 W180 B30 ; Use PID on bed heater (may require further tuning)
    M305 P0 T100000 B3950 C0 R4700 ; Set thermistor + ADC parameters for heater 0
    M305 P1 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 1

    ; 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

    ; Network
    M552 S1 ; Enable network
    M586 P0 S1 ; Enable HTTP
    M586 P1 S1 ; Enable FTP
    M586 P2 S0 ; Disable Telnet

    ; Fans
    M106 P0 S1 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P1 S1 I0 F500 H0:1 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
    M106 P2 S1 I0 F500 H0:1 T45 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

    ; Custom settings
    ;Endstop set to Active Low
    ;Geometry refined (X, Y, Z max)
    ;Z home trigger height at z axis = 0.1
    ;Motor milliamps = 1200
    ; Selected preset thermistor coefficient (e3D)
    ; Extruder - 400.97 steps / mm (calcuated)
    ; X and Y motor steps / mm set to 100 (calculated)
    ; Z steps / mm = 1600, set Extruder fan to 100%
    ; M501 to load override params
    ; Keenovo Bed parameters - P0 T100000 B3950 C0 R4700

    ;Enable Pressure Advance
    M572 D0 S0.1

    ; Miscellaneous
    M501 ; Load saved parameters from non-volatile memory
    T0 ; Select first tool

    Any recommendations would be greatly appreciated.
     
  2. Old_Tafr

    Old_Tafr Well-Known Member

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    I suspect a lot of problems when filament is jammed are due to the difficulty and complexity when assembling the hot-end, heat-break and heat-sink and may be related to how the ptfe is cut, the correct length, straightened, not countersunk at the top and the inside diameter not checked for obstructions.

    Plus correct application of thermal compound and only on the heat-break where it screws into the heat-sink.

    I have put all I could remember from my original notes on the assembly in this post...

    https://forum.e3d-online.com/index....-extrude-more-than-once-help.2753/#post-29282

    If you are getting jamming with two different filaments then the common factor is the assembly, or how you cool the heat-sink and always letting the fan run (usually automatically) until it gets down to 40oC when cooling down.

    I took particular care to cut the ptfe to the correct length and cut absolutely square and not crushed, countersunk at the top to receive the filament, then checked the ID (and straightness) with a drill bit.

    I found my ptfe tube as supplied bent in a radius of the storage spool, crushed at the end by cutting with side cutters (probably by me!) and had a lot of resistance when I tried (out of the heat-sink) to feed filament through manually.

    It is also possible to mount the blue fan shroud the wrong way up so decreasing the flow of air over the heat sink.

    I guess the new clip to sit under the little black bowden fitting in the top of the heat-sink is also a good investment.

    -------------------

    It is worth doing a search on Titan and "clicking" as there are lots of posts on this including some from early Titan shipments that had some out of spec hobbed wheels.
     

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