[BUG] Auto-home with a probe on v.2.1.2.2 crashes nozzle into bed

[jradwan]

Did you test the latest bugfix-2.1.x code?

Yes, and the problem still exists.

Bug Description

After upgrading from 2.1.2.1 to 2.1.2.2 (and -bugfix), when I perform an auto-home on my Ender 3 Pro with a CR Touch installed, the probe extends and the Z-axis starts moving downward. But after the probe touches the bed the Z-axis continues to move down and grinds the stepper motor and nozzle into the bed until I turn the power off.

Going back to 2.1.2.1 fixes the issue.

Bug Timeline

after upgrading from 2.1.2.1 to 2.1.2.2

Expected behavior

CR Touch/Z-probe should stop nozzle from crashing into bed

Actual behavior

Probe touches bed, light turns red, but Z-axis continues to move down grinding stepper motor and driving nozzle into bed until power is shut off.

Steps to Reproduce

Motion > Auto Home

Version of Marlin Firmware

2.1.2.x-bugfix

Printer model

Ender 3 Pro

Electronics

4.2.7 32-bit board

LCD/Controller

No response

Other add-ons

No response

Bed Leveling

ABL Bilinear mesh

Your Slicer

Cura

Host Software

OctoPrint

Don't forget to include

• A ZIP file containing your Configuration.h and Configuration_adv.h.

Additional information & file uploads

All of my changes/customizations are tagged with "JCR" in these files. Attached are my working files from 2.1.2.1 and the files used with 2.1.2.x-bugfix that cause the problem.

2-1-2-x-bugfix-configs-auto-home-crash.zip

[ellensp]

What type of MPU is on your creality 4.2.7 STM32F103RE, STM32F103RC or GD32F303RE ?
And what build environment did you use?

And where is your probe attached? from the config the probe should be using the 5 pin probe port and nothing else

[tu77]

after Upgrading from 2.1.2.1 to 2.1.2.2 my double Z-Axis is not homing anymore, I get a "kill" after some minutes, kind of timeout..
maybe it is a similar issue.

I did compare my old and new config files but find no reason for the Problem.

Printer type:
core XY
dual Z axis
2 Z-home switches only (no BL or probe)

[jradwan]

What type of MPU is on your creality 4.2.7 STM32F103RE, STM32F103RC or GD32F303RE ?

STM32F103RET6

And what build environment did you use?

default_envs = STM32F103RET6_creality

And where is your probe attached? from the config the probe should be using the 5 pin probe port and nothing else

Yes, attached to the dedicated probe port on the board, original Z-stop removed nothing plugged in there.

[classicrocker883]

i also have CR-touch with 427, I have never noticed this issue. I have heard there may be issues with this and HS (high speed) mode and definitely had experienced problems with this enabled like using M48.

what UI are you using, ProUI? Jyers?

[jradwan]

I have not enabled BL_TOUCH_HS_MODE and Z_MIN_PROBE_REPEATABILITY_TEST is also disabled.

I'm on an Ender 3 Pro, so no special UI, just the stock LCD and rotary encoder.

[stonesword0]

I had this same issue with the new firmware. I have a BLTouch, so it is likely an issue with the 4.2.7 mainboard.

Thank you for reporting this, I would have never figured out why my BLTouch isn't working!

[jradwan]

Thank you for reporting this, I would have never figured out why my BLTouch isn't working!

I'm glad I'm not the only one!

[buff0k]

Can confirm same issue with 4.2.2 Motherboard on an Ender-5 Pro.

[ellensp]

Me two-ing provides extremely limited information.

Please include config files and details of how your bltouch is wired (probe port, probe port and z-stop, or using an adapter such as a pin 27 adapter) and what probe you really have bltouch, crtouch, 3dtouch etc

Reminder:

If probe is plugged into the 5 pin probe port you need this in your configuration.h

//#define Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN
#define USE_PROBE_FOR_Z_HOMING
//#define Z_MIN_PROBE_PIN -1

If probe is plugged into z-stop pin and probe port you need this

#define Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN
//#define USE_PROBE_FOR_Z_HOMING // Is enabled automatically
//#define Z_MIN_PROBE_PIN -1

You only define Z_MIN_PROBE_PIN if its not already defined (if you board has a probe port it is defined)

And BLTOUCH_HS_MODE and BLTOUCH_FORCE_SW_MODE cannot be used on crtouch or 3dtouch.

[buff0k]

I use a CR Touch connected to the Probe Port, Z-stop disconnected.

//#define Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN
#define USE_PROBE_FOR_Z_HOMING
#define Z_MIN_PROBE_PIN PB1

//#define BLTOUCH_HS_MODE true
//#define BLTOUCH_FORCE_SW_MODE

(Above worked for 2.1.2.1)

Configs addatached
2.1.2.2.zip

As for clarifying me too, 2.1.x-bugfix and 2.1.2.1 did not have this issue, configs migrated manually or using the template, i.e. the issue is 2.1.2.2 related.

[thisiskeithb]

2.1.2.2 has some issues & needs a few patches, so I'd recommend updating to bugfix-2.1.x if you need a specific feature or hardware support.

You can also stick with a previous version if that is working for you until 2.1.3 is released.

[ellensp]

I think i've found something which looks like a very likely suspect to break many probes in the probe port.

In 2.1.2.2 Marlin/src/inc/Conditionals_post.h is

 #if ALL(ENDSTOPPULLUPS, USE_Z_MIN_PROBE)
    #define ENDSTOPPULLUP_ZMIN_PROBE
  #endif

But USE_Z_MIN_PROBE is not part of 2.1.2.2, it came from bugfix by mistake.
So ENDSTOPPULLUP_ZMIN_PROBE is never defined.

Update this code to

  #if ALL(ENDSTOPPULLUPS, HAS_Z_MIN_PROBE_PIN)
    #define ENDSTOPPULLUP_ZMIN_PROBE
  #endif

And ENDSTOPPULLUP_ZMIN_PROBE gets defined as it should.

Can anyone with this issue very carefully test Z homing with this patch?
@jradwan @buff0k

[ct16k]

I have an Antclabs BLTouch v3.1 connected to a BigTreeTech SKR Mini E3 v2. Can confirm with the above suggested patch the probe now works as expected.

diff --git a/Marlin/src/inc/Conditionals_post.h b/Marlin/src/inc/Conditionals_post.h
index 6794087ca4..4e18fd3938 100644
--- a/Marlin/src/inc/Conditionals_post.h
+++ b/Marlin/src/inc/Conditionals_post.h
@@ -2852,7 +2852,7 @@
   #ifndef PROBE_OFFSET_YMAX
     #define PROBE_OFFSET_YMAX  50
   #endif
-  #if ALL(ENDSTOPPULLUPS, USE_Z_MIN_PROBE)
+  #if ALL(ENDSTOPPULLUPS, HAS_Z_MIN_PROBE_PIN)
     #define ENDSTOPPULLUP_ZMIN_PROBE
   #endif
   #ifndef XY_PROBE_FEEDRATE