[3.6.0-beta.4] H parameter in new M558.3 does nothing

MaxGyver

I had the chance to test the new touch mode for analog Z probes. After a little trial and error, I got it working reliably enough. Unfortunately, the H parameter for Nozzle height to be assumed when touch is detected doesn't do anything in my case. I started with an H-parameter of zero until I got the probe triggering repeatably. When doing an G30 the nozzle height is alsways about 0.3mm too low no matter what H-parameter I use.

dc42

@MaxGyver thanks for reporting this. I confirm it is a bug, which will be fixed in the next build. Meanwhile I suggest you use a G92 Zxx command to adjust the height.

Tushonk

Still an issue in my testing in 3.6.0-rc.1 (STM32 version with Fly E3 Pro V3 and Fly SHT36 Max V3), using the SZP as the sole probe in a 2-stage homing process as described in the SZP calibration docs. No matter what I set the H parameter to I can't see any difference using a feeler gauge.

Tushonk

@Tushonk homez.g
By can't see any difference with feeler gauge I mean after homing I move Z down to 0.2 to use a feeler gauge to feel the gap, for example if H in line 13 is -0.1 I feel the same resistance as H at -0.5.

gloomyandy

@Tushonk It looks like your homing macro is using G30 s-1 for the touch home, this will not be setting z=0, you need to use G30 (with no S-1) to set z=0. Can you change this and test again to see if the H parameter is working.

Tushonk

@gloomyandy Yes that was it, thank you!