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jlas1 / Klicky-Probe

Microswitch probe with magnetic attachement, primarily aimed at CoreXY 3d printers
GNU General Public License v3.0
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Fix an issue where toolhead can crash on repeat homing because safe_z is being blindly overwritten with current z position #262

Open jmeier5261 opened 2 months ago

jmeier5261 commented 2 months ago

Address an issue with blindly assuming that if Z is already homed then it is above safe_z which was overwriting the value of safe_z to the current Z position when re-homing if Z was already homed, regardless of whether the current position was actually above the safe_z. Additionally included small typo fixes for logs.

Use case here is that because the machine is in a homed state, if my print fails or ends or any other action leaves my toolhead below specified safe_z height, the machine will not be returned to the actual safe_z when re homing because the code added in ac98aefb41dad7a62af7ded3610c21b70bca1efb will overwrite the user variable safe_z with whatever the current Z position is. Ideally we would want to do this only if the current Z is actually above configured safe_z

jmeier5261 commented 2 months ago

I want to mention that I am unsure if the change which was added that caused this is actually necessary...it seems that at every point after this, safe_z is only considered if current z position is below it so I'm not sure what the point of setting safe_z to the value of current Z. It may be better just to remove the block itself? I didn't test that approach sufficiently to say. I did notice in the recent fix to that statement https://github.com/jlas1/Klicky-Probe/pull/244, the comment on the PR doesn't match the contents of the line itself: so not sure if this was intentional at all.

jlas1 commented 2 weeks ago

Thanks for this, let me check it out