1 hour ago, gandy said:That may imply that the firmware checks for which z-height the capacity sensor's signal starts to flatten out. That would be the position where the nozzle makes contact with the bed surface. It would be quite independent from the bed material, too (metal under glass or bare aluminium), as long as there is something the sensor can react to. But it could still leave a certain offset that needs to be corrected.
Correct. It moves the nozzle a certain distance and then checks the change in capacity. At some point you will have a "knee point" where a given move doesn't result in an as great value change. We fit 2 lines on this and the intersection is the z distance.
The z offset plugin wasn't written for Ultimaker printers in mind but for printers that don't have auto bed leveling (it was also not written by us, but that doesn't mean it might not be usable for Ultimaker printers of course)
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gandy 10
@ahoeben, thank you for the suggestion. I somehow hoped for an actual settings parameter in the printer.
I do not really know how active leveling is implemented in the UM S5. Surely, the capacitive sensor in the printhead is used to determine the distance of the printhead from the bed. During each probe, the nozzle not only touches the bed, but the bed is raised a little further still, so much it tilts ever so slightly, barely noticable. I've seen a few videos of other S5s and also UM3s doing the same, so I assume it's part of the probing scheme. That may imply that the firmware checks for which z-height the capacity sensor's signal starts to flatten out. That would be the position where the nozzle makes contact with the bed surface. It would be quite independent from the bed material, too (metal under glass or bare aluminium), as long as there is something the sensor can react to. But it could still leave a certain offset that needs to be corrected.
Maybe someone from ultimaker could bring a little light into this, the fact that someone went to the troubles of writing a z offset plugin in the first place indicates that I'm not the only one struggling with the initial layer height. And honestly, I believe this needs to be corrected at the printer level, not the slicer.
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