Max volumetric speed test goes wrong

I’ve had the Anycubic Kobra S1 for a few weeks now. So far, my prints have been pretty good, as I’ve already tweaked the settings quite a bit.

Since I’ve started running into new issues, I decided to calibrate the printer using every relevant test. The temperature tower showed the best results for black Anycubic PLA at 190 °C.

Next, I wanted to continue with the maximum volumetric speed test. However, after two runs, I kept getting the exact same result, so I stopped the test halfway and decided to ask for help.

To be honest, I’m not even sure what this test is supposed to tell me at this point, because I haven’t had issues this severe before — not even before I decided to start doing all these calibrations.

I’m not really sure what the problem is here. Maybe someone can help me out :/

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    parent
  • parent

    I think the first layer just went badly. No adhesion, not even the brim, Clean the PEI well with hot water and soap or isopropyl alcohol and set the Z offset correctly, be careful when the printer does its Z homing, the nozzle is clean otherwise it induces an offset

    Basic PLA does not have a high volumetric speed, so with such a low temperature, it is normal for the tests to be poor in my opinion.

    The higher you increase the temperature, the more you increase the maximum volumetric speed until the quality deteriorates

    Although the temperature tower shows a correct test at 190°C, Anycubic PLA is closer to 210°C with good cooling. Also note that the more humid a filament is, the less meaningful the calibrations will be.

    Dry the filament properly. Don't hesitate to raise the temperature to 50°C with the Ace Pro. Its insulation is fairly poor, and the thermometer inside shows a temperature of only 40°C. Do this for at least 8 hours or more but check the internal temperature just in case.

    Then recalibrate the filament at a temperature of 205/210°C for a brass nozzle (add 5/10° if using a metal nozzle), such as: flow rate, pressure advance. Then try again a maximum volumetric speed test

    parent root

    First of all, thanks for your input.
    I cleaned the print bed exactly as you described. The nozzle temperature is back at 210 °C, and I also adjusted the Z-offset slightly.

    At first, it looked better, but then the print started to lose adhesion on the curves and lifted up the print bed, so I canceled the test again.

    What could cause this issue besides print bed cleanliness?

    parent root

    Oh, well, this filament is prone to warping. Internal tensions must build up, and after a while, the adhesion to the plate is no longer sufficient and it comes loose

    There is a slight gap between the part and the brim. In "Other > Brim > Brim-object gap," you can try setting it to 0 so that the part is welded to the brim and is less likely to come off

    What are your bed and first layer temperatures? Also avoid activating the auxiliary fan, as it tends to cause the PLA to shrink and detach thin parts having little grip on the plate and those too close of it

    parent root

    My first layer temperature is also 210 °C, and bed temperature is at 55°C. Should I try to put the auxiliary fan to 0%?

    I already now put the brim-object gap to 0%, im just waiting for your answer for the auxiliary faauxiliary fan setting and I will try again :)

    parent root

    For the tests I put the auxiliary fan at 0%, then here it will detach the part more than anything else

    parent root

    okay I will try it now then

    parent root
    parent root
    parent root

    On the first layers, as they are slower, the cooling is different from the other layers, which creates a different color. This is especially noticeable with matte filaments, where the faster you go, the shinier they become

    For your print you can leave the auxiliary fan on as long as it doesn't interfere with the adhesion of the part on the plate

    parent root

    Alright, thanks for all your input

    parent root