K1 MAX Bad first layer

Seems like a lot of people have first layer issues with the K1 Max, so do I. If someone has a solution, please let me know. The problem is mainly these high stripes that occurs. Please see pictures.

I have had some theory that the issues occurs due to an un flat bed, and sure, the flatness of the bed is terrible but I’m still unsure if that really is the issue.

I have checked the bed with a ruler and a blade measure a come up with the following results:

Bed temp room temperature:
The bed is around 0,3mm low in the middle.

Bed temperature 45 degrees Celsius.
Bed seems to be really flat actually. Can’t find any defects.

Bed temperature 100 degrees Celsius.
The bed is low on one edge with 0.6mm….
And generally un even.

I have tried run the self leveling calibration with a bed temperature of 45 degrees in the hope that the issue should’ve been solved when printing PLA. But the results are still bad.
I have also tried printing on a glass bed and still get bad results, kind of the same.

The first layer flow have been set to both 95% and 105% and it results in under and over extrusion.

I’m currently out of ideas of what to check.
Do I have hardware issues or just bad settings?

Filament used when printing is Hyper PLA supplied by creality.

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What slicer are you using…? Have you changed any settings for the Z offset to see what effect it has…?

I’m using creality print. Have not yet changed the z-offset. Don’t really see how it will make any difference when I sometimes have both under and over extrusion in the same test.

My bed has the same issue but I’m not having that problem as in your pictures.

For PLA Silk or Generic:
Nozzle: I use 220-230C
Bed: 55C
Reset the profile and start again.
I did a test with a 50 x 50 piece and checked different z offset settings.
See what that setting is in your profile for PLA.
I don’t think it’s an extrusion issue.
The nozzle is either too close or too far away…

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Made one more test when I preheated the buildplate for a longer time to 45 degrees and then made the auto leveling. This time the results turned out better, but still bad at the edges. The exact same settings otherwise.

I am able to print smaller things with ok results. But if I place several of them all over the buildplate some of them becomes pretty bad.

Maybe the main issue is the buildplate anyway which just continues to change shape…
There is just to much residual stresses in the material from the manufacturing.

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I had this, after the first 2 horrible attempts. In C-Print, after an excellent suggestion (Thx mucho @jimandyen !) modified the settings to Z-offset -0.04 (under Experimental tab cuz nothing else really works).
I started playing to see the effects of altering a few variables.
Across the bottom is speed based on 300mm/s in %
Up the side x, y, z represents the temp 220, 235, 240 (otherwise 230)
Bed temp always at 60c
Lotsa stuff going on (started shimming underneath with aluminum foil strips)
As a result, I print in particular areas depending on the print and the dimensional accuracy required.
I have a brand new bed sent by CS (Thank you!) that I haven’t used yet because my prints are fairly consistent now at 300-600 mm/s

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I always check this box for Print Calibration. I noticed that the bed seems to adjust as the print is being made. Maybe someone knows a little more about what that does…?

Yup, I use it for every print. It’s an interesting setup for sure. Similar effect to the BLTouch as it modifies the Z for every point on the bed. As the stepper motor moves at differing speeds, depending on the bed aspect change, it almost makes it musical! Neat effect, +1
But it does make a calibration map, just wish I knew where the file gets stored so I could take a look at it, just haven’t made the effort yet.

Got it. Thanks for the explanation. It does seem to make a difference…

I have also tried this things with z-offset and other settings as well. It will be a difference in some spots but worse in others.
I was in contact with CS and they made me do some test when using paper as shims under the PEI plate and suddenly the results turned out a bit more even. So now I’m currently waiting for a new hot bed.

I have managed to get pretty ok results with a print bed temp of 45 degrees. But when printing ASA at a temp of 90-100 degrees the shape of the hot bed is changing way too much.

I have tried running the auto bed leveling at different bed temperatures. It works at 45 degrees but at 90 degrees it waits until the temperatures lowers to around 50 degrees. I guess it’s due to the nozzle sweep. Hopefully creality will change this in the next firmware update. Think it will make a huge difference.

Interesting about the calibration. If I put a check in creality print and send directly to printer I won’t notice any difference. If I send the gcode to the printer and start the print from the display with the calibration box checked it will do the z pattern test. Either way the bed is always changing position in z depending on where it prints, this according to the latest auto leveling performed I guess.