I found a good way to calibrate the nozzle (1) to top camera distance:

- Put a small paper label on a known PCB position.
- Pick up a small nozzle, then put the nozzle down to an rubber stamp ink pad
- Open a new pcb job and add the locations manually to smt list as part locations.
- Move the nozzle to the position, add a part to part list and take over to a part location in PNP job.
- Manually drive the nozzle down, until it touch the label. You receive a stamp print on the surface.
- Reset Z axis
- Move the camera to this position, it should be exact in the center of the circle
- Add a part to part list and take over to a part location in PNP job.
- Calculate the deviation and update basic settings. Don't forget to save!
- Don´t forget to clean the nozzle :-)

Posted originally by UJep edited by me