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Outside of making 3D printers accessible I'm not sure how libraries could feasibly offer workshops. People don't only work in plastic, and presently 3D printing is a novelty for your average person.
With the Chicago library's lab, they offer various workshops on some small example projects (e.g. a 3D printed trinket or a laser cut greeting card) to expose people to the basic process and offer open lab hours. You can look at the schedule here. I'm not sure where you see a problem with the feasibility of this.
3D printing is to a large extent still in the novelty phase, but as it gains in popularity so will the practical applications. I have a broken plastic component of a relay in a 70s era pinball machine for which purchasing a replacement isn't an option. It is however a simple geometric design and I plan on printing a replacement at the library.
I get upgrade copies of windows from my University for like $8. I have a CD binder with Win XP (no sp, sp1, sp2, sp3, x64), Vista, Win7 (x32, x64). That includes multiple copies of some where I had friends pick them up.