Define printer nozzle size

The print settings in the instructions do not state the 0.4mm nozzle required.

From the Forum, 0.6mm nozzle does not print the optics module well, but seemed OK for the main body:
https://openflexure.discourse.group/t/which-configuration-for-dark-field-blood-imaging-0-6-nozzle-and-petg-possible/1109/22?u=williamw