Reorder probe sequence to reduce ooze about klipper_z_calibration

[TitusLabs]

Yes, that could be a good sequence. I mean, I don't have a problem with oozing. I do clean the nozzle and the next step (and first step of the calibration) is probing the nozzle. So, oozing afterwards is not an issue anymore. This would be cleaned with a intro line (or brim) before starting the print. But, there maybe different situations out there...
The problem is, you split the calibration process into two parts. And I don't want to do that. That would be too complicated and error prone. The alternative would be to integrate all the steps between as custom gcode... and I don't like this as well 🤔
How is it now? Is oozing still a problem for you?

[poernahi]

After running further experiments with various ooze mitigation strategies, I found that the most repeatable process is the following:

• At print end or print cancel, retract enough filament to clear the nozzle. For my setup this is approximately 10mm.
• When preheating before print, set hotend to a temperature where filament ooze easily. We want as low viscosity as possible but not too hot that it burns the filament.
• Wait until ooze stops. The nozzle should be empty now.
• Clean up the nozzle
• Probe and calibrate. There should be no more ooze at this time. Can even lower the hotend temperature a bit here.

Without clearing the nozzle, I found that some of the more viscous material like PETG creates a very noisy nozzle height reading. Modifying the z-endstop to require higher actuation force helps somewhat but still unreliable as some plastic can still get between the nozzle and endstop pin. There is a limit on increasing the actuation force as well as too much will cause deflection of the whole toolhead depending on the stiffness (quality) of the X linear rail and the toolhead assembly.

I will close this for now as my idea above is not good enough to solve the oozing problem. Thanks for the plugin!

[TitusLabs]

Great! I heard about ooze problems especially with the Revo hotend. Waiting some time helps 👍