Retraction issues


  • administrators

    RepRapFirmware will do whatever the gcode generated by the slicer commands. It isn't normal to retract and travel at the same time, although some slicers have a "wipe while retracting" option.



  • @dc42

    The way im describing it is probably wrong. I know its not retracting correctly though. On my stock anet board the nozzle would never stop to retract, and if it did it wasnt long enough for me to think hey something is wrong. On the Duet the hotend stops dead in its tracks long enough for me to notice something is wrong with my settings or something. Ill have to get a video of it as I know im not describing it correctly lol.


  • administrators

    Perhaps you have the maximum extruder speed or acceleration set much too low in the M203 or M201 command?



  • @dc42
    Probably, im going to try some changes when i get off work. Are we able to upload videos directly or do we have to upload somewhere like youtube?

    Using my phone thats why I ask.

    Thanks dc42


  • administrators

    Upload to YouTube and post the link here.



  • @dc42

    Thanks will do when I get off work.

    Any ideas as to why when I get my nozzle offset corect after a first couple layers print the nozzle starts to scrape over the top of the print?

    I calibrated the extruder steps and when I extrude 100mm of filament 100mm is indeed what is taken up. So I dont think it can be that. I was thinking maybe the z axis steps, but thats the same as I had in Marlin. Is there like an offset per layer or something?



  • May have figured out my issue with the nozzle dragging on the print after the first layer or so. Searching around i found that a M8 rod 1.25 pitch at x16 should have a value of 2560 steps/mm i have mine set to 400 steps/mm ill have to try when i get home



  • @stealthy_tt Are you maybe skipping steps on the Z axis?



  • @phaedrux
    Not skipping that i am sure of, see my reply above you, i think i figured it out but wont know till later



  • Okay, So just messed with my Z steps/mm 400 is infact correct with my printer afaik. I homed z and took a measurement and then moved z up 10mm and it was exactly 10mm. so thats not my dragging issue.



  • https://youtu.be/IFxbb1yQTXU

    Heres the video of what it is doing. The hums you hear are it retracting and re extruding



  • Did increasing jerk and acceleration help at all?
    What do the retraction settings look like in Cura?



  • @phaedrux

    current settings in Config.g
    ; Drives
    M569 P0 S1 ; Drive 0 goes forwards
    M569 P1 S0 ; Drive 1 goes forwards
    M569 P2 S0 ; Drive 2 goes backwards
    M569 P3 S0 ; Drive 3 goes backwards
    M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
    M92 X100 Y99 Z400 E470 ; Set steps per mm
    M566 X500 Y500 Z60 E800 ; Set maximum instantaneous speed changes (mm/min)
    M203 X15000 Y15000 Z800 E1800 ; Set maximum speeds (mm/min)
    M201 X1000 Y1000 Z800 E8000 ; Set accelerations (mm/s^2)
    M906 X800 Y1500 Z800 E800 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S0 ; Set idle timeout

    Cura settings
    retract distance: 6.5mm
    retract and prime speed: 80mm/s
    retract extra prime amount: 0


  • administrators

    Try reducing the Z acceleration in the M201 command.



  • @dc42

    Thanks dc I’ll try that.

    Another thing, sometimes i have to home all twice in order to get all axis homed. It usually happens when I move an axis by hand or with the web gui past roughly the center point.

    For example

    I home all and it works correctly, my config is set to put the hotend in the center of heat bed after it homes. So after homing the hotend will be at 185 for x and y. So if I move X with the web gui +100 and do another home all command it will usually fail to home X and I’ll have to home all again for it to make it to the limit switch. Is there a fail safe setting for homing distance somewhere?



  • @stealthy_tt I`m having the same problem of it rubbing over the print .,so much that it wears out a cheap Chinese nozzle half way through the print and a titan aero which stop half way through the print for no reason .



  • @peter247

    If you’re rubbing that much I’d assume that the reason the extruder is stopping is because your nozzle is so close that the filament can’t flow though.

    Is your nozzle offset correctly from the bed?

    I’m not rubbing too bad, just enough to cause a little extra stringing and mine only shows up after layer 1 or two


  • administrators

    @stealthy_tt said in Retraction issues:

    @dc42

    Thanks dc I’ll try that.

    Another thing, sometimes i have to home all twice in order to get all axis homed. It usually happens when I move an axis by hand or with the web gui past roughly the center point.

    For example

    I home all and it works correctly, my config is set to put the hotend in the center of heat bed after it homes. So after homing the hotend will be at 185 for x and y. So if I move X with the web gui +100 and do another home all command it will usually fail to home X and I’ll have to home all again for it to make it to the limit switch. Is there a fail safe setting for homing distance somewhere?

    The maximum homing distance is defined in the G1 S1 commands in the homing file(s) for that axis.



  • @dc42 haha Thanks I knew it had to be something like that.


 

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