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M270 is used in several files to define the new probe. This command does not shiw up in the duet wiki. What’s the story?

It controls the double-tapping behavior.

g.

But where is the syntax. Its not in the wiki?

FYI, M270 was pretty short lived and isn't in the production firmware any longer.
I would grab the latest firmware & configuration files from the SeeMeCNC git repo, here: https://github.com/seemecnc/RostockMaxV3.2

g.

Thx Gene. I followed the link In the upgrade wiki. Guess it was old.
The reason I was struggling with it was that although auti calibrate works fine, when i run mesh comp, it fals with”z probe akready triggered” after the 1st point is probed. I reduced the radius to 120 to see if it would help but it didn't. Not sure where to look.

That problem is caused by the first probe script not turning the bed off. The new version on github shouldn't have that problem.

The reason it's a big deal is that the bed throws off a lot of EMI at close range and it makes the little microcontroller on the SE300 board go nuts. If you pay close attention, you can see the blue "hit" light flashing in sync with the red power LED on the heated bed. This isn't a problem during printing, but it plays merry hell with everything during calibration.

I didn't know about this issue until it bit me and I didn't get it figured out until I brought in the Big Guns.

g.

I noticed the flashing and figured that was happening so I turned off hotend fan and hot end and bed. Still same behavior though.