I think it would be much more sad if the lab were shut down by the “outrage du jour” that you envisioned above.
If I don’t see a spring loaded hammer and firing pin, or striker; and a barrel, as far as I’m concerned it isn’t a functional gun. Thanks to your warning I will be on the lookout for suspicious characters printing out parking meter parts, though 
One of our local allies is Pumping Station One, a subscription based hackerspace. The first time I ever went there, long before the CPL maker lab was even in the planning stages, was to take my daughter to a lock picking class.
So lock picks would be fine, except that the Makerbot’s PLA plastic is almost certainly too brittle, and the laser cutter wouldn’t cut a heavy enough gauge of steel. As Librarians we like to refer people to other sources if we don’t have what they need, so after giving people a first taste of the possibilities we will be sending many of them to Pumping Station One, to make things we can’t, like lock picks.
