Probe height: Mesh vs Leveling
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Hello,
I have a bed on a kinematic mount (ie 3 arms with a spindle each), this bed can tilt a LOT by design and when messing with the bed with the steppers unpowered, it can easily happen that one of the arms move and gives the bed a big tilt.
Auto bed leveling easily fixes this, however, I need massively big dive heights for the probing, otherwise it can happen that the probe triggers just from moving to the probing points. (Which is not allowed and triggers an error)
If I set the dive height to like 10 or 20mm, things are fine, however, after leveling the bed, this large value is completely unnecessary and for doing the mesh afterwards it wastes a lot of time.
So what I'd like to do is to dynamically adjust the dive height, basically setting it very high for leveling and then reducing it to around 3mm for the mesh probing.
Question being, can I "re-configure" my probe on the fly easily? Or can we possibly get an option to set multiple dive heights just like we can set multiple speeds for first/following probes?
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You can easily execute a M558/G31 pair to change the settings on your probe.
But I have read that if you do an M558 you must do the G31.
I dealt with this problem by installing an endstop sensor for each Z stepper and home Z using normal G1 H1 commands.
It's much quicker than using a probe.
I then use the probe (G32) to fine tune the leveling of the bed.
If you like you can see a video here where I start with the bed badly out of level.
Triple Z Bed Homing and Leveling Video
Frederick
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One approach, that works for me, is bottoming the bed with low stepper current. This gives you a good starting point for probe based leveling and then a mesh probing. I don't like end switches
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@fcwilt said in Probe height: Mesh vs Leveling:
Why?
FrederickMore cables, configurations, and complexity. I have a HEVO printers with no end stops, relying on stalling and on a BLTouch probe.
Edit: my next printer is going to be a Voron V2.4 which is on the other end of the minimalist vs over-engineered spectrum.
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Thanks for the suggestions
I think I will try the dynamic configuration route then for now, endstops are unfortunately not possible, my boards are already maxed out when it comes to that (it's a toolchanger with a microswitch on each tool to detect docking state...)
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@zapta said in Probe height: Mesh vs Leveling:
I have a HEVO printers with no end stops, relying on stalling
OK that's one point of view.
To me using stalling is like stopping your car by running into the car in front of you because you don't like brakes.
Frederick
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@fcwilt said in Probe height: Mesh vs Leveling:
To me using stalling is like stopping your car by running into the car in front of you because you don't like brakes.
That's a good analogy. I often do that. Not exactly bumping into cars but slowing using the clutch and gear, thriving for the perfect down-shift.
Seriously, there is beauty and aesthetic in minimalist and efficient designs, as opposed to the 'brute force' and 'kitchen sink' ones, but that of course is very subjective.