Very slow ABS extrusion speed (5mm/s)



  • It seems that I can't extrude ABS faster than 5mm/s. If I increase the speed, the extruder starts skipping steps, and even if not, it looks like plastic is not melted enough when it comes out.

    I think I have 40w 12v e3d heater cartridge and e3d v6 hotend. 0.4mm nozzle. BondTech extruder. Duet 0.8.5 with latest firmware.
    I have ran heater calibration.
    I increased temperature to 250c, and it did not seem to help.

    Is there something I'm missing?
    What extrusion speed should I expect with my setup?

    I did not see people complaining about low extrusion speeds. And I think I even printed ABS myself faster than that before (but I have switched hotend and extruder since then, and it was a while ago).

    Any advice is really appreciated!



  • is your thermistor setting correct for the e3d hotend?
    post it here to verify



  • Thanks, I will double-check that (because I haven't).

    But also, I forgot to mention that I've installed nozzleX, and perhaps that is the reason the heat is not reaching the plastic as well. I seem to remember someone mentioning issues with thermal conductivity of the nozzle.



  • @biocomp said in Very slow ABS extrusion speed (5mm/s):

    nozzleX

    yes steel does not transfer heat to the filament as well as bronze. you will need higher temperatures



  • @biocomp do you mean a filament extrustion speed of 5mm/s? That's not bad, over the target of 10mm3/sec.



  • A linear filament speed of 5mm/sec equates to about 12mm3/sec which would be over 100mm/sec print speed with 0.48mm track width and 0.25mm layer height.

    Edit:

    12mm3/sec is 100mm/sec with 0.48 track width and 0.25 layer.

    Volumetric Print Rate (mm3/s) = ([filament speed] * pi * [filament radius] * [filament radius] )
    12.02mm3/s = (5 * 3.14 * 0.875 * 0.875)

    Print speed (mm/s)= ([filament speed] * pi * [filament radius] * [filament radius] ) / ([track width] * [layer height])
    100.17mm/s = (5 * 3.14 * 0.875 * 0.875) / (0.48 * 0.25)



  • @DocTrucker said in Very slow ABS extrusion speed (5mm/s):

    A linear filament speed of 5mm/sec equates to about 12mm3/sec which would be over 100mm/sec print speed with 0.48mm track width and 0.25mm layer height.

    Hmm, indeed, thanks for pointing this out!
    I incorrectly took 5mm/s and set it as my base printing speed, while I should have gone with something like 100mm/sec.

    @Veti, I checked my thermistor setting and it was a bit off, but not really.
    I'm having troubles with M305 command though. Seems like it requires 'R4700' although documentation says it doesn't. Also it seems to ignore the H setting that adjusts the temperature. I suppose I should start another thread about that.



  • @biocomp Easily done! It's a bird's nest of parameters that need to be fettled for a great print and it is all to easy to get lost.



  • I just bumped my base printing speed to 100mm/s (from 5) and it seems to be working out more or less 🙂



  • @biocomp said in Very slow ABS extrusion speed (5mm/s):

    Seems like it requires 'R4700' although documentation says it doesn't

    that might only apply to duet2s


  • administrators

    @biocomp said in Very slow ABS extrusion speed (5mm/s):

    I'm having troubles with M305 command though. Seems like it requires 'R4700' although documentation says it doesn't. Also it seems to ignore the H setting that adjusts the temperature. I suppose I should start another thread about that.

    The R parameter is only needed when using the legacy Duets (0.6 and 0.8.5). For Duet 2 and 3 each board has only ever used on value series resistors, and the firmware knows what this value is.

    The H parameter isn't implemented on Duets that use automatic ADC calibration, such as Duet Maestro and Duet 3.



  • @dc42, thanks for response. I have duet 0.8.5, and seems like I do need H parameter. But it is definitely being ignored when I set it. Could it be that my firmware (1.24 (2019-06-13b2)) has it disabled (looks like it's ifdefed in the code depending on configuration?).



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