Understandig problems aka brain goes afk about klipper_z_calibration

[eduncan911]

Ah, the brain is unaware of the Klicky Probe options that Vorons and Annex Engineering uses. Annex calls theirs the "quick draw" endstop.

It's a magnetic probe that gets "picked up" during homing, it touches the bed as it's lower than the nozzle (hence probe offset in the renderings). And the probe gets dropped off when done.

Quick video showing it. It's hanging down off the gantry to the left in this video: https://youtube.com/watch?v=FXPBqCQUCng

Ok the README, you'll see the nozzle endstop, and then the large rectangular object - that's the Klicky Probe with a tiny microswitch on it.

The Vorons also have a separate metal rod in the back of the printer that we use as the Z endstop when the nozzle hits it. This plugin also touches the Klicky Probe to that endstop, and automatically calculates the nozzle-to-probe offset. So you can change nozzles and hotends however often you want - it calculated the Z offset from the probe with this plugin, I stead of hardcoding. Perfect first layers everytime!

[TitusLabs]

@eduncan911 thanks for your nice explanations 👍

This approach eliminates nearly everything which could change in a printer and would also lead to a changing Z offset. The good thing of the simple dump switch is, that it does not suffer from any temperature drifts like metal rods or electronics do. If you print in a closed printer with a bed temperature of 100C and a chamber temperature of up to 60C, this does have a big impact.