Most up-to-date source for BL Touch installation

garyd9

I forgot to mention: If you want to use that P9 parameter, you'll need to be using the latest (RC4) beta firmware. Personally, I'd suggest using the newer firmware anyway, as it seems pretty stable these days (and resolves some issues that existed in older versions.)

Drammy

OK, ta, and by firmware, we're talking the new board firmware; nothing to do with the BL touch itself..

Phaedrux

@Drammy:

OK, ta, and by firmware, we're talking the new board firmware; nothing to do with the BL touch itself..

Correct. The new duet firmware 1.21. The official release should be right around the corner now if you don't want to use release candidates.

Drammy

Cheers guys

Drammy

Hi all,

So I'm swapping out my z end stop for a BL touch.

I've installed and tested the BL touch and all is working as (I think) is expected.

I'm following the instructions from here and under the Commissioning and Testing section the page reads:

If all is good It is at this point that you can deploy the probe using the M280 P3 S10 I1 command and slowly lower the nozzle to the bed and find out your own Z trigger height, when the probe touches the bed and the pin retracts you can take a reading of the Z height and use that to input into the G31 command in the config.g file

I have no Z height as I'm using the probe to set the Z minima, or should I keep the end stop on and use the end stop to determine z minima. Confused..!

Why do I need to set a z height in G31? Isn't it always going to be 0??

dc42

The G31 Z height is the height of the nozzle above the bed when the Z probe triggers. The firmware needs to know that. See https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe.

Drammy

Ah, of course.

Any tips for how to set it when I have no z height value? Is there a better way than best-guessing with some digital calipers?

Drammy

When performing a bed execution I get the following error followed by a load of triangle interpolation toast messages…

[[language]]
Version: 1.21-RC4
Message: Uncaught SyntaxError: Unexpected token W in JSON at position 108
URL: http://192.168.0.9/#
Line: 3:1
Error object: {}

upon interrogating the response the value shows:

[[language]]
Bed equation fits points [60.0, 25.0, 0.062] [60.0, 125.0, 0.317] [175.0, 125.0, 0.400] [175.0, 25.0, 0.202] [100.0, 100.0, 0.293]

Warning: Triangle interpolation: point outside all triangles!

tjb1

@Drammy:

Ah, of course.

Any tips for how to set it when I have no z height value? Is there a better way than best-guessing with some digital calipers?

It says how to do it in the link David posted, see here - https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe#Section_Calibrate_the_Z_probe_trigger_height

dc42

@Drammy:

When performing a bed execution I get the following error followed by a load of triangle interpolation toast messages…
[[language]]
Version: 1.21-RC4
Message: Uncaught SyntaxError: Unexpected token W in JSON at position 108
URL: http://192.168.0.9/#
Line: 3:1
Error object: {}
upon interrogating the response the value shows:
[[language]]
Bed equation fits points [60.0, 25.0, 0.062] [60.0, 125.0, 0.317] [175.0, 125.0, 0.400] [175.0, 25.0, 0.202] [100.0, 100.0, 0.293]

Warning: Triangle interpolation: point outside all triangles!

We recommend mesh bed compensation (G29), not the 5-point bed compensation you are using.