BlTouch reduce probing height

[peirof]

Hi,

Sometimes i am having errors when calibrate my delta, with a BlTouch, i have this error message, from DWC:

• Error: Z probe was not triggered during probing move

And calibration finish with a error...

I understand, I'm not sure, that when you try a point in the calibration ... or start too high or not enough down the print head to find the bed

I think I remember that this could be adjusted ... but I do not remember how.

How do you adjust the distance that the head goes down to look for the bed?

or

How do I start the calibration closer to the bed?

Thank you

[peirof]

Hi,

for the moment, i have changed this

M558 P9 X0 Y0 Z1 H5 F120 T5000 ;

To

M558 P9 X0 Y0 Z1 H10 F120 T5000 ;

If i have understand, H is the probing distance.... for the moment, with this avoid no triggers, but... i think head start probing moves far from bed... i am still interested in reduce this moves....

[dc42]

That's correct, the M558 H parameter controls both the initial height above where the firmware thinks the bed ought to be at which probing starts, and the maximum probing distance (which is twice the H value). So if your delta printer is not well calibrated, or if you have changed something that may affect the calibration, use a large H value. When it is well-calibrated and you have copied the new parameters into config.g, you can use a smaller H value.

[fcwilt]

@dc42 said in BlTouch reduce probing height:

and the maximum probing distance (which is twice the H value).

That should be in the docs for M558.

I was wondering why things weren't working as I expected - now I know.

Thanks.

Frederick

[peirof]

@dc42 Ok... But a What height start to probing? That it depends on the height at which it begins to taste. Of the dimensions of the printer?

[dc42]

@fcwilt said in BlTouch reduce probing height:

That should be in the docs for M558.

Done, see https://duet3d.dozuki.com/Wiki/Gcode?revisionid=HEAD#Section_M558_Set_Z_probe_type.

[fcwilt]

@dc42 said in BlTouch reduce probing height:

@fcwilt said in BlTouch reduce probing height:

That should be in the docs for M558.

Done, see https://duet3d.dozuki.com/Wiki/Gcode?revisionid=HEAD#Section_M558_Set_Z_probe_type.

You should get a raise for staying on top of things!

Thanks.

Frederick

[peirof]

I am using the wizard in web [http://www.escher3d.com/pages/wizards/wizardbed.php](link url) for generate bed.g, but when i try to select 12 and 6 halfway points, the wizard says a message that the limit of points its 16, but....

i am member of a facebook group of Duet in Tevo Little Monster, and have in files section a bed.g file that have 24 points, and add this gcode at start of file "M561; clear any bed transform"

Some answers/dudes:

• This extra points, 24-16=8, are taken into account for the calibration?
• The gcode, M561, its useful at start of bed.g? what is your function?
• In my case... when i calibrate, after calibrate, in the second calibration, the deviation is less. How many times its recommend calibrate?
• Calibration... After o before compensation? or After and before?

[dc42]

@peirof, that wizard is a little old now. Does the wizard in the configurator at https://configurator.reprapfirmware.org/ allow you more points?

If you are using both auto calibration and bed compensation, you must run auto calibration before mesh bed probing.

[Dougal1957]

@dc42 David

I have just checked the configurator and it will allow 17 points max (10 + 6 + centre) and only allow 3-7 factor calibration as well.

I still use the wizard on your site to be fair.

Doug (see you at TCT)

[peirof]

Hi,

the configurator inRepRAp configurator, allow the same points that the configurator in Escher Escher configurator. The dude, the same...

• The bed.g in Tevo Little Monster Duet user group, has 24 points.... these points are taken into accoint for calibration?