Math Domain Error (Enhanced delta calibration)

[joan-aluja]

Hello!

I recently went back to Klipper after messing around with RepRapFirmware and Marlin. I successfully installed Klipper (using KIAUH) and got started with the configuration. I successfully calibrated my delta printer using the basic delta calibration guide and started printing the calibrate_size.stl file. And afterwards I started inputting the measurements with the following commands.

DELTA_ANALYZE CENTER_DISTS=73.50,73.95,73.85,73.75,74.15,73.60 DELTA_ANALYZE OUTER_DISTS=73.50,73.55,73.95,73.90,73.45,74.15 DELTA_ANALYZE CENTER_PILLAR_WIDTHS=9.00,9.00,9.05 DELTA_ANALYZE OUTER_PILLAR_WIDTHS=9.00,9.00,9.00,9.00,9.00,9.15 DELTA_ANALYZE SCALE=1.0 DELTA_ANALYZE CALIBRATE=extended

After pressing Enter when sending "DELTA_ANALYZE CALIBRATE=extended" Klipper crashes and an error pops up "Math Domain Error". It seems the error is coming from klipper as it is shown on the log.

I have attached the log below.

klippy_math-domain-error.log

I have checked in Fluidd and I have the latest version installed.

Let me know if you need anything else.

Thanks!

[joan-aluja]

It seems the crash comes from

z = -math.sqrt(radius2[0] - x**2 - y**2) in line 107 mathutil.py

Somehow the value of radius2[0] - x**2 - y**2 becomes negative and then spits out the error because it can't calculate the sqrt of a negative number.

I've printer another calibrate_size.stl because I had changed some settings in the slicer and I entered the following:

DELTA_ANALYZE CENTER_DISTS=73.90,74.35,74.10,74.00,74.55,74.00 DELTA_ANALYZE OUTER_DISTS=73.75,73.90,74.30,74.20,73.85,74.40 DELTA_ANALYZE CENTER_PILLAR_WIDTHS=9.25,9.20,9.40 DELTA_ANALYZE OUTER_PILLAR_WIDTHS=9.25,9.30,9.30,9.10,9.30,9.30 DELTA_ANALYZE SCALE=1.0 DELTA_ANALYZE CALIBRATE=extended

And it still gives the exact same error and output on the log

I'm going to open a topic on the forum to see if someone comes up with a solution

[github-actions[bot]]

Hello,

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[joan-aluja]

Issue seems to still be present. I'm going to try again and get more info as this issue seems to happen with different values

[KevinOConnor]

Alas, I haven't had a chance to look at this. Something definitely went wrong during the calibration.

-Kevin

[joan-aluja]

Hi. I've tried to figure out what is causing the issue but I don't know much Python. If you need me to check anything on my side please tell me!

[github-actions[bot]]

Hello,

It looks like there hasn't been any recent updates on this Klipper github issue. If you created this issue and no longer consider it open, then please login to github and close the issue. Otherwise, if there is no further activity on this thread then it will be automatically closed in a few days.

Best regards,

~ Your friendly GitIssueBot

PS: I'm just an automated script, not a human being.