Printing costs are pretty much insignificant for documents as small as the typical publication. If you really like it to be on paper, printing ten pages, reading them and throwing them out is still cheaper than spending an extra ten minutes of your time to walk somewhere and fetch an existing copy. Printing a paper costs much less than a dollar in supplies, walking to a library costs much more than a dollar of paid-for time. In this case, convenience is cost efficient and it does
not make sense to rely on centralized paper copies to try and save a few cents of toner.
Seriously, I'd only consider going to the library if I need a whole book (for a single chapter I wouldn't bother, digital or local printing is fine for that) or if the resource is not available in a digital format at all, which is getting exceedingly rare unless I need something really old. Especially if I've decided that I need paper X for whatever reason, then it'd be useful to read it right now at my desk instead of some time later this day after a visit to library.