K2 First Layer ABS

Flagship K Series Creality Flagship K2 Plus & CFS
1

First I want to say I have looked through posts regarding first layer issues to try and avoid reposting the same stuff.

What I will say is I’ve had some real issues getting a good first layer. Currently the issue is with Polylite ABS. Occasionally a print will work, but it seems to be a matter of luck if some type of extruder error occurs during the first layer. Layers after that are fine. Currently, I’m trying to use the Flow Rate calibration tool within CP 6 and can’t get past the first test without an error. Below are things I’ve done so far.

  • Level the bed with foil, .32 variance in bed
    -Used @frankjoke 's excellent filament calibration tutorial to get at least close
    -Used the temperature calibration tower (265 seemed best)
    -Max volume flow calibration (15mms^3)
    -Tried z-offset of 0.0 and 0.050. Haven’t gotten a chance to go to 0.010 yet.

The result has always been spikey first layers that result in CM2784, abnormal resistance in z direction, and most recently CM2788.

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Most recent failed first layer resulting in CM2788

Any thoughts on dialing in further so I can actually complete a Pressure Advance calibration, and if I dare dream, an actual print?

PS: I’ve had this issue too with thoroughly dried PETG, but given it’s difficulty and tendency to stick to nozzles, I figured I should worry about a material like ABS before trying to make PETG work,

2

Does this thread throw any light on your problem?

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Hm, it gives me some other options to try. I discovered that to clear any of those error codes and to get the extruder motor to attempt working again I need to restart the machine. I think my process is going to be trying to do a pressure advance test with a 0.010 z-offset, then trying a PA test with a generic ABS profile, after that I might try CP5, then CP5 and older firmware. And all the variations of above…

I also have some nozzle flushing filament coming in incase there is some resistance in the nozzle and hotsection.

Kinda funny how the errors not clearing without having to manually restart the machine has become something I’ve acclimated to accept.

P.S. Just realized that I run a Bento Box in my printer for high VOC filaments and that may cause currents affecting the first layer. I should probably try leaving that off for the first few layers.

4

Yes turn it off or right the way down. Good luck with the rest. I’ve run Creality Hyper ABS was almost like printing PLA.

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Well the filament profile I was creating was for polylite ABS, but figured it didn’t matter because I made a print in Creality Hyper ABS and it also had a failure with error messages before creating a pretty terrible first layer that I think just barely avoided cause a nozzle blockage error.

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Try wash build plate thoroughly…i had same problems till i washed build plate in soap and water i now do that every 5 prints or so and prints mint

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Def part of my regular routine. Wash and rinse thoroughly, degrease with alcohol, use bed adhesion stick.

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Did you get to the bottom of this, in the end? I’ve had my K2PlusCombo since 20th Feb (just in time for the latest 1.1.2.6 firmware) and am having the same “first layer so squshed it causes extruder error”, but only intermittently (about 30% of the time). Mostly with ABS, but it also did it once with PLA (which had hitherto been error-free). Still not got to the bottom of this (all my slicing has been with C.P.6.0.3 and latterly 6.0.4).

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Squished first layer is almost certainly because of thermal expansion of the nozzle.
Since bed leveling is happening at different temperature (140) and the actual printing happens at 200+, there’s a difference to the distance between the nozzle and the print bed.
The way I’m handling it is by loading different bed mesh profiles (depending on the starting filament type; named as PLA, ABS, etc) from the printer’s starting g-code section, which I have created manually from the Tune page of the printer’s web interface.
Another way would be to set the z offset, again depending on the starting filament type and perhaps in combination with the bed surface type (PEI sheet, cold plate, etc). See frankjoke’s How to set Z-Offset based on used build plate and filament with simple klipper macro post for a starting point

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See the post just above this one. My solution was to raise the z offset manually, but creating a separate profile might be best.

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What if noticed is that with the chamber heater activated teh first layer is really bad. I made an orca script which activates the heater after a few layers so that the bed warping doesnt have a big effect anymore. While it is still not perfect is is definitely usable and i can print large ASA parts without any adhesive.

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I imagine that if the bed warps a lot due to heat, it could potentially create problems with the model losing it’s grip to it.
I’ll test it and see how it goes