Changed probe, now "No trigger on stepper_z after full movement"

General Discussion
1

Basic Information:

Printer Model:
MCU / Printerboard:
Host / SBC
klippy.log

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Describe your issue:

Voron V0 TriZero (triple belted Z)

SKR2 mainboard.

Raspi4 SOC.

config-20251005-213829.zip (8.5 KB)

I was running Tap/Boop as a bed probe, and recently converted the toolhead with an E3D PZ Probe. Now, when I try a G28 Z command as part of Homing Override, I get an error “No trigger on stepper_z after full movement” after the bed moves up about 5-10mm. I have changed very little except the [Probe] section of the printer.cfg, and messed about with E3D’s recommendation of lower stepper_z current while homing. I am totally at a loss. Any advice would be appreciated.

klippy(13).log (8.7 MB)

2

I spent some time changing and trying the presets on the PZ probe board, and the problem ceased when using setting 4, 5 or 6

3

Have you already checked the E3D troubleshooting infos? PZ Probe Standalone – E3D

4

Hi @Rainforetnomad ,

If you run a QUERY_PROBE command, what does it output?
If you press on the nozzle and run the command again, what does it output?

5

Is your problem solved? If it is please mark it solved.

6

Yes I have read the full page you linked already, my problem isnt described in the troubleshooting section.

7

The probe triggers when properly, is open on query_probe and triggers when tapped or touched. Have played with the various presets and noticed a difference in sensitivity.

8

Its not fully solved, as the behaviour changed as well. My quick update was somewhat premature. Id still be curious to know why the error occurs at a higher probe sensitivity, as I would expect “probe triggered prior to movement” or simply an early trigger before actual contact with the bed. On preset 4, the bed no longer lowers first before moving up.

9

I think I may understand what im seeing when I try to home Z. At first, the bed would move down a bit, and them begin to home towards the nozzle, after which point it would throw the error. Then after I changed the setting to 4 on the board, the bed would home towards the nozzle without moving down first. My belief is that at first, the board would see a false trigger before moving, and then begin a second homing whereupon it would move down 3mm then up about 10mm and not seeing a trigger this time, throw the error I was seeing. After changiing the board preset from 0 to 4, i introduced filtering and decreased sensitivity and then the board wouldnt get a false trigger, and so would home properly.

Does this make sense to anyone?

10

I have found some corroborating posts on discord, and on youtube about the “spurious” triggering of the probe, and I think I’m on the right track. There will be alot of trial and error getting this thing going. I’ll close this thread as I dont think klipper is doing anything wrong here, It’s just not obvious what is happening at first.

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