@gloomyandy Yes that was it, thank you!

@gloomyandy Yes that was it, thank you!

@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.

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.