Hi, On Tue, 12 Nov 2019 09:35:30 +0200 Efraim Flashner wrote: > At the very least I think the udev rules should be added to the cups > service. Hmm, does cups have anything to do with scanning? Long term, people will not print things anymore but will scan things (until such time where that stops, too), so "cups" will be way less important that "sane" in the long run--and, if optional, it can easily be that a user has "sane" but not "cups" in the system. I'd prefer to just add (simple-service 'custom-udev-rules udev-service-type (list sane-backends-minimal)) unconditionally (if it doesn't increase the size anyway).