I was manually (via touch screen) moving my Z axis, thinking that the bed leveling sensor will act as an endstop, but instead my extruder keep lowering even with sensor triggered. Since it was hot now i have a hole in my flex plate :(
Is mine an issue? there is a way to use the bed leveling sensor as an endstop to prevent things like this?
The probe when triggered tells the printer that it's 3mm above the surface, but in actuality it might only be 1mm. It does this to allow for a maximum offset of 3mm in the cura start gcode.
This seems odd to me, is it normal printer programming? I see in the marlin code where you have set this 3mm, I checked some other printers and they have this set to 0mm. In those printers you set the Z probe to paper thickness and generally assume this to be 0mm offset. Depending on if you are using PLA, mashed in to table, or PETg, no mash, you +/- the Z Offset in the material configuration.
No math required!
without perfectly setting the sensor to trigger at exactly 3mm above print platform. performing the offset calibration is necessary. and seems to me a much simpler operation. but that might just be me.
the simple math problem expedites the whole leveling process. rather than checking the probe after adjusting each time. and really it seems 6 of one half dozen of the other. either way you do it the results are the same
Generally you can manually move into mechanical end stops, the bed surface is considered one of those. It seems whenever I replace the sticky sheet and reset the Z stop sensor, I put a hole there...
consider Manual motions as God Mode and you're it.