Extruder clicking/going backwards



  • @deckingman said in Extruder clicking/going backwards:

    @pedromelim The "problem" is that the extruder clicks when going in reverse (as per your title) yes? It manifests itself during retraction or with PA enabled. In both those cases, the extruder can run in reverse. So stopping the extruder from doing those types of moves, or limiting the amount of reverse movement won't cure the problem. It'll merely help to hide it. As I said before, it's likely backlash in the gears or possibly a faulty bearing. It might be worth checking that the grub screws holding the hobbed gear on the motor shaft is tight. If it was a genuine BMG then I'm sure that Bondtech would advise, supply replacement parts, or even replace the entire unit if it was under warranty. You could try approaching the supply of the clone to see if they would offer the same service.

    As said before...the noise and the clicking still happen when the motor is not attached to the extruder. Thats why it doesnt make sense how much it is happening.



  • can you try adding
    M569 P3 D2
    and see if it still clicks.



  • I think I encountered and tried to explain the same problem a while ago. TL;DR: Duet CPU can max out given enough steps per mm, speed, acceleration and print resolution.

    I suppose that stepper control is no longer fluid, probably due to too many interrupts? The only way to solve it is to reduce print speed, disable PA, move to direct extrusion, reduce print resolution (or get another board, ha, except there aren't any really better ones other than Duet 3).

    You might try slowing your printer down and it might help enough so that it prints. Lower the speed, increase the X, Y, Z jerk, perhaps.



  • @pedromelim said in Extruder clicking/going backwards:

    As said before...the noise and the clicking still happen when the motor is not attached to the extruder. Thats why it doesnt make sense how much it is happening.

    I must have missed that. So it's the motor that makes a clicking noise, not the extruder yes?



  • @Veti said in Extruder clicking/going backwards:

    can you try adding
    M569 P3 D2
    and see if it still clicks.

    Tried it and its the same, but seems less prominent.

    @deckingman said in Extruder clicking/going backwards:

    @pedromelim said in Extruder clicking/going backwards:

    As said before...the noise and the clicking still happen when the motor is not attached to the extruder. Thats why it doesnt make sense how much it is happening.

    I must have missed that. So it's the motor that makes a clicking noise, not the extruder yes?

    Ya, well...the "clicking sound" only happens when attached to the extruder but the motor on its own does the same movement.

    Probably all of this is just bad config speeds jerk etc. My experience with pressure advance was only on a Prusa Mk2.5 and i had none of these issues.



  • @pedromelim said in Extruder clicking/going backwards:

    only happens when attached to the extruder but the motor on its own does the same movement.

    as deckingman said. the backwards movement is exactly how Pressure advance works.

    check the grub screws inside of the bmg. they can become loose as well.



  • @Veti said in Extruder clicking/going backwards:

    @pedromelim said in Extruder clicking/going backwards:

    only happens when attached to the extruder but the motor on its own does the same movement.

    as deckingman said. the backwards movement is exactly how Pressure advance works.

    check the grub screws inside of the bmg. they can become loose as well.

    Checked them both, they are all ok.

    I managed to print a full benchy with the base values i started with, without pressure advance, and im getting mixed results.

    When it prints slowly i get very nice finish but there there are parts that i get underextrusion and over extrusion. Its really weird.

    http://prntscr.com/ptnkrn
    http://prntscr.com/ptnl82
    http://prntscr.com/ptnlfc

    with this config:

    M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
    M92 X80.00 Y80.00 Z400.00 E409.31 ; set steps per mm
    M566 X900.00 Y900.00 Z60.00 E3000.00 ; set maximum instantaneous speed changes (mm/min)
    M203 X15000.00 Y15000.00 Z300.00 E8000.00; set maximum speeds (mm/min)
    M204 P6000 T6000 ; Set printing and travel accelerations
    M201 X6000.00 Y6000.00 Z60.00 E3000.00 ; set accelerations (mm/s^2)
    M906 X1000 Y1000 Z1000 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    Retraction was between 5 or 6.5, not sure wich one and sretraction speed 60mm/s.



  • M204 P6000

    Your print accelerations are really aggressive. Try M204 P1000

    What slicer are you using?



  • @Phaedrux said in Extruder clicking/going backwards:

    M204 P6000

    Your print accelerations are really aggressive. Try M204 P1000

    What slicer are you using?

    Prusa Slicer, and i would prefer still keeping using it as i have an Mk2.5



  • @pedromelim said in Extruder clicking/going backwards:

    60mm/s.

    i had problems when i went above 40mm/s retraction speed.


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