Mesh bed levelling - probe twice?

kia

Hello everyone,

I am running a Prusa style printer with a genuine BLTouch for a while and for a few weeks with the Duet wifi.

I was wondering if it is somehow possible to probe every point while mesh bed levelling twice or three times and save the average value of every single probing point for the hight map to compensate for z-probe inaccuracies.

Didn't find anything in the documentation or the forums about that. Sorry if I overlooked something.

Kia

Veti

https://duet3d.dozuki.com/Wiki/Gcode#Section_M558_Set_Z_probe_type

Annn Maximum number of times to probe each point, default 1
Snnn Tolerance when probing multiple times, default 0.03mm

kia

Thanks a lot! totally missed that.
So I simply add A and S to my config.g, right? Does the sequence matter?
in my case i think it would be: M558 P9 H5 F120 T6000 A3 S0.03

Veti

the sequence does not matter.

kia

Thank veti!

Phaedrux

@kia said in Mesh bed levelling - probe twice?:

M558 P9 H5 F120 T6000 A3 S0.03

S0.03 is the default already, so to make it more stringent, decrease that value. For my BLTouch I use 0.003 for instance.

A3 may be a bit low for that level of stringency, so maybe bump it up to 5 or more. Usually 2 probes at each point is enough, but occasionally it will take 4 or 5.

zapta

@kia said in Mesh bed levelling - probe twice?:

probe every point while mesh bed levelling twice or three times and save the average value

From the documentation, it will average the first two consecutive probes that have similar readings. That is, no general average of N readings.

dc42

@zapta said in Mesh bed levelling - probe twice?:

From the documentation, it will average the first two consecutive probes that have similar readings. That is, no general average of N readings.

Recent firmware versions will do N readings and average them all if you set the tolerance negative.

zapta

@dc42 said in Mesh bed levelling - probe twice?:

Recent firmware versions will do N readings and average them all if you set the tolerance negative.

I missed that part. Thanks.