Hi there! Thank you for getting back to me and letting me know the Community was able to help you out. I understand that the photo of the knob in the manual is not matching the knob and markings for the setting on your Air Filter. This sounds like it is not preventing it from being set now, but if you run into any other trouble adjusting the knob settings to get the filter to run during prints, reach out and let me know. I’ll leave this this thread open just in case you run into anything else. Thanks again!