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[BUG] 2.1.2.2 severely impacts reliability of BLtouch sensor on Mega2560 8-Bit boards #27066
Comments
Please download |
In version 2.1.2.2, there are occasional issues during bed leveling where it skips probing points or crashes into the bed. These issues were not present in versions 2.1.2.1 and 2.0.9.7. The probe I use is an IR sensor, and there were no problems before the update. |
As I mentioned above, please download |
Yes, I tested with the latest version today, but the same issue occurs. The control board I am using is the FYSETC E4 V1.0. |
Whenever there are homing or leveling issues, we now ask everyone to follow a standard procedure to gather more information:
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. |
I'll do it once I have my current project finished and have time to flash the new firmware on it again. I already tested the bugfix branch btw, same result. |
My problem is a failure to probe at the first or a subsequent location after the center-table probe. Z seems to rise a few mm before descending, and never quite getting to the table surface. MKS GEN L V1 |
Lots of compile errors around probe type options, "#IF" statements following disabled declarations |
Did you test the latest
bugfix-2.1.x
code?Yes, and the problem still exists.
Bug Description
For some reason after updating to 2.1.2.2 the accuracy of my BLtouch went completely down the drain to the point where it's not usable anymore.
Zero changes to the hardware and no relevant changes to either configuration.h or configration_adv.h except for those minor things required for the update.
On 2.1.2.1 the repeatability test gives me a standard deviation of around 0.002.
On 2.1.2.2 the same BLtouch sensor fails the test with a deviation of sometimes over 0.2mm.
A bed mesh generated on 2.1.2.1 looks like this:
The mesh on the same machine with zero hardware changes on 2.1.2.2 resulted in this monstrosity:
It seems that something in the code changed that causes the firmware to not read the reported values of the BLtouch correctly anymore or making the sensor output overly noisy.
Rolling back to 2.1.2.1 fixed the issue so it's definitely firmware related and not caused by a faulty BLtouch or some other hardware related issue.
Bug Timeline
started after updating to 2.1.2.2
Expected behavior
The BLtouch should give reliable measurements
Actual behavior
Unreliable measurements and high std deviation in the repeatability test
Steps to Reproduce
No response
Version of Marlin Firmware
2.1.2.2
Printer model
Heavily modded Anycubic i3 Mega-S
Electronics
Anycubic Trigorilla 14 (Ramps 1.4) Mega2560 based 8-bit board
LCD/Controller
FYSETC_MINI_12864_2_1
Other add-ons
No response
Bed Leveling
ABL Bilinear mesh
Your Slicer
Other (explain below)
Host Software
OctoPrint
Don't forget to include
Configuration.h
andConfiguration_adv.h
.Additional information & file uploads
bltouch_issue_2122_conf.zip
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