For Load Cell/Nozzle probes, How to adjust for the probe's Z offset? about klipper_z_calibration HOT 6 CLOSED

I ended up using SET_GCODE_OFFSET Z_ADJUST=-0.2 in my CALIBRATE_Z macro override, at the end. Turns out I wasn't verifying with GET_POSITION for the gcode_base variable, which did show SET_GCODE_OFFSET Z_ADJUST working.

I think the solution here would be to allow for switch_offset to allow NEGATIVE numbers.

As for skipping the switch probe, I had to edit the z_calibrate.py to:

# switch_zero = self._probe_on_z_endstop(self.helper.probe_switch_site)
switch_zero = nozzle_zero

I wonder if this could submit this as a Pull Request? The possibility of skipping the Switch Probing step by having it set to the same as the Z endstop?

I'm thinking it could be a simple boolean, defaulting to False to always probe the switch surface. True would skip it / force it to be set to the same as the Z endstop.

from klipper_z_calibration.

I'm not sure why or how you use this extension. If you have a load cell at your nozzle, then this extension would be pointless since you already have a direct nozzle-probe 🤔
So, this flex means that you need to over travel by 0.2 until the sensor reacts? Is this a fixed or varying value?

from klipper_z_calibration.

I'm not sure why or how you use this extension. If you have a load cell at your nozzle, then this extension would be pointless since you already have a direct nozzle-probe thinking

ah, i didn't mention that in all of that text above. The CR6SE comes with two z-endstops. One on the load cell/probe itself.
But, there's also an Optical sensor - that no one uses! Well, I want to use it!

I use this plugin for the optical Z for ultra fast Z homing (50mm/s now) as a FIXED offset of something like 0.875 - based on the probe's exact measurements. Then the load cell at much slower speed (@ 4mm/s) for precise offset to take away from this 0.875 number for a precise offset.

Minus, the negative -0.02 that I need to offset the probe, because of the "Bend" of the load cell (see below).

So, this flex means that you need to over travel by 0.2 until the sensor reacts? Is this a fixed or varying value?

It's fixed via an adjustable POT on the circuit board. but yes, once it is set, it remains roughly at that -0.02, or at least that's what I tuned it for for the best non-false-positives.

from klipper_z_calibration.

so basically, i'm cheating... i;m using this plugin to take two measurements, and then the negative -0.02 to account for the load cell.

I got around all of that by commenting out the line above. And I suggested making a PR to add that as a new variable in the ocnfig, that can be flipped on/off (defaulting to False, so it's backwards compatible).

My entire homing, including Z-homing, is extremely fast. Been needing to make a video about it as it's really impressive with the high-speed and and low-speed.

from klipper_z_calibration.

This is a nice creative solution!
But, since you misuse this plugin, I will not introduce an option to disable the probing on the switch. This step is essential for the intended purpose.

The core function is just the probing on the endstop. Maybe Klipper could be more flexible on this point. Then a little macro would be enough to achieve this 🤔

from klipper_z_calibration.

Aiight, if no option to set or override switch_zero, then I'll close the issue. Thanks again for looking!

from klipper_z_calibration.