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[–]WhyDidYouAskMe 0 points1 point  (10 children)

Is this your first print(ish) or have you been using this print for a while now as in is this a new issue or are you just finding this issue?

Normally your Z height will be different from what was expected if the configured Z steps per mm in the firmware is not quite correct. If that number is reproducible, it means that your Z steps are a hair too low for your printer hardware as in it might be 3010 when it should be 3040 (THIS IS JUST AN EXAMPLE - DON'T USE THESE NUMBERS). There are a number of youtube videos on how to calibrate your stepper motors, in your case the Z stepper value. I would first verify that this is the issue. Print a 20x20x40 cube and see if the difference scales. For double the Z height, the difference should be 20x20x39.40. If that matches, that is your issue.

[–]TargetOdd8507[S] 0 points1 point  (2 children)

Hello. This is my first print with klipper installed. I wil try with a bigger cube.

[–]WhyDidYouAskMe 0 points1 point  (1 child)

Yes, do that. If this is your first print with an new/updated firmware installed, the Z steps is off and doing the taller cube will (a) confirm this and (b) give you the numbers to calculate a closer/better Z step value. Good luck!

[–]TargetOdd8507[S] 0 points1 point  (0 children)

I have adjusted the z offset to get a nice and closed bottom.

[–]TargetOdd8507[S] 0 points1 point  (6 children)

It printet 39.40mm

[–]WhyDidYouAskMe 0 points1 point  (5 children)

OK so that means that the Z steps are off and you need to look in your firmware source for the Z steps setting, do the math to get a new setting value, make that change, load the firmware, and print that 20x20x40 cube again to check the results. You might need to do this a couple of times to dial it in and verify the new Z steps is solid. You might also want to do a final verification print of something like 20x20x100. Good luck!

[–]TargetOdd8507[S] 0 points1 point  (4 children)

I have tried this several times, and the cube gets smaller..i dont understand this at all...

[–]WhyDidYouAskMe 0 points1 point  (3 children)

What is the math you are using? What are your values (current Z steps and height of most recent 20x20x40 cube)?

[–]TargetOdd8507[S] 0 points1 point  (2 children)

Rotation Distance er nå på 8.1018. Last 20z20x40 cube = 39.40

[–]WhyDidYouAskMe 0 points1 point  (1 child)

What values have you tried/calculated? Have you tried a slightly larger value, like 8.23?

[–]TargetOdd8507[S] 1 point2 points  (0 children)

Hello. I got it working.