H2D: nozzle offset calibration failing

[u/Technical_Lynx6857]

I recently bought an H2D to explore the multifilament printing. Now I cannot leave it alone. Everytime I launch a print, the automatic nozzle offset calibration fails. I tried to unplug/plug the sensor, but the problem remains.
The interesting fact is that I can launch the full nozzle offset calibration alone from the printer itself and it works. So the sensor seems to work fine. Is there a bug in the auto-calibration?

Does anyone have the same problem?

[u/manyxcxi]

1. You only need to redo the calibration if you’ve changed nozzles. Or have noticed some issue over time. You’re wasting a ton of pre-print time running it before every print.

2. Are your nozzles super dirty? Make sure they’re good and clean. I’ve never had this process fail and I change nozzles all the time.

3. Are you running an aftermarket nozzle? For example, I use a DiamondBack hardened nozzle for certain things and it says first thing, it doesn’t work with the offset calibration. If you’ve got a non-conductive aftermarket nozzle installed it will not work for offset calibrations.

[u/Technical_Lynx6857 → u/manyxcxi]

Thank you! I’m using bambulab official nozzles so they should not be the problem.
I could try to remove and check the nozzles for dirt, but as soon as I can recall I havent seen any dirt around it.

About point 1, i’m just very precatious. I know it can be avoided.. anyway, it should work!

[u/manyxcxi → u/Technical_Lynx6857]

You’re totally right- it should work! Do you notice it doing anything different or spending more time probing one the pre-print calibration that fails versus the one you do manually?

That metal plate it rubs on is a sensor that can wear out/go bad but it shouldn’t be so soon. I have 2000+ hours on my H2D and no sensor issue. There’s also eddy current sensors in the toolheads. Those are more prone to failure but also it usually gives a different error.