[BUG] G34 not compensating about marlin HOT 7 CLOSED

Whenever there are homing or leveling issues, we now ask everyone to follow a standard procedure to gather more information:

• Download Marlin bugfix-2.1.x to test with the latest code.
• Enable DEBUG_LEVELING_FEATURE and M114_DETAIL and re-flash the firmware.
• Connect to your printer from host software such as Pronterface, Repetier Host, or OctoPrint.
• Send M502 and M500 to ensure your Configurations are applied.
• Issue the command M111 S247 to enable maximum logging.
• Perform a G28 to do your standard homing procedure.
• Do a G29 to probe the bed. This will also enable bed leveling.
• Do a G34 to start the Z Steppers Auto-Alignment procedure.
• Do some of the moves that revealed problems before. Take notes.
• Copy the log output into a .TXT file and attach it to your next reply.

Repeat this procedure, if needed, to demonstrate inconsistencies. From these logs we should hopefully get a better idea of what's going on with your machine.

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thisiskeithb

Ok, but Z auto align Will give me a report??? Because bed leveling seem's to work ok, but so much difference between to end of the axis, so it's hard to validate that bed leveling is ok....

from marlin.

Ok, but Z auto align Will give me a report??? Because bed leveling seem's to work ok, but so much difference between to end of the axis, so it's hard to validate that bed leveling is ok....

I've updated my comment. Add G34 after G29 so it can be logged.

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Configuration.zip
g34.txt
thisiskeithb

Ok I downloaded the last bugfix version
Is it normal that when I send G29 by pronterface it does nothing? I have to do G29 P1

Did all what you said, but I want to copy the report, I scroll up, and I can't find the beginnng, I just have report in the middle of G34???

What I did wrong??

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https://github.com/thisiskeithb

Finally I switch the wire motor on the board, and I can acheive accuracy of 0.01 with 30 itteration!!

So now it's working, but how why it take 30 itterations to do it?? Starting from .322 to 0.01

I was too fast to celebrate, try to did it again and result is inconstant....
G34_inconstant.txt

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Finally I switch the wire motor on the board

Looks like there is a hidden define in the Chrion pins file that fixes Z motor plugs without having to physically swap Z motors, but it's good to fix the hardware like you've done.

So now it's working, but how why it take 30 itterations to do it?? Starting from .322 to 0.01

G34 should stop after the value you have in your config (#define Z_STEPPER_ALIGN_ITERATIONS 10), not 30.

I was too fast to celebrate, try to did it again and result is inconstant....

A value of 0.01 for Z_STEPPER_ALIGN_ACC may not be easily achievable for a number of reasons, particularly for hardware that isn't super rigid / has play in it. This can be especially true for a machine as large as the Chiron.

The stock Chiron config we maintain has the following Z_STEPPER_AUTO_ALIGN settings:

  #define G34_MAX_GRADE              5    // (%) Maximum incline that G34 will handle
  #define Z_STEPPER_ALIGN_ITERATIONS 5    // Number of iterations to apply during alignment
  #define Z_STEPPER_ALIGN_ACC        0.02 // Stop iterating early if the accuracy is better than this
  #define RESTORE_LEVELING_AFTER_G34      // Restore leveling after G34 is done?

I have been using G34/Z_STEPPER_AUTO_ALIGN on several machines this week and cannot reproduce these issues, so you should spend some time dialing in the settings mentioned above.

The AnyCubic Chiron Facebook group may be a good place to find which settings fellow Chiron users run or you can check out the following resources for additional help:

• Marlin Documentation hosted on MarlinFW.org
• Marlin Forum hosted on RepRap.org
• Marlin Firmware Facebook Group
• Marlin Firmware for 3D Printers Facebook Group
• Marlin Configuration on YouTube
• Marlin Firmware Discord server

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https://github.com/thisiskeithb

I'm feeling a little shy, shame on me, the problem was that my second Z stepper was connected on Z2 instead of E1 so now it's working. I was able to achieve perfect accuracy 0.00, but it's not perfect somethime I have to do it a couple of time, because sometime it compensate in the wrong direction an I've got the message Accuracy decreasing....

But that doesn't resoleve my main issue it to print on a perfect leveling bed

Since I put the last bug fix firmware I've got message Probing fail, when I put Bi-Linear it simply said unable to enable bed leveling, so I switch to Linear and I have probing fail... I have report but unble to interpret it...

And I just realized that M48 repeatability test fail too, before I put new firmware It was really great...

probe-fail.txt
Configuration_adv.zip

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