Here is a pointer to a recent article on policies for 3D printers. FYI:

  A Model for Managing 3D Printing Services in Academic Libraries
  by Vincent F. Scalfani in Issues in Science and Technology
  Librarianship, Spring 2013

  The appearance of 3D printers in university libraries opens many
  opportunities for advancing outreach, teaching, and research
  programs. The University of Alabama (UA) Libraries recently
  adopted 3D printing technology and maintains an open access 3D
  Printing Studio. The Studio consists of a 3D printer, multiple 3D
  design workstations, and other supporting equipment. Training of
  new Studio users (students, faculty, and staff) is a two-step
  process: an initial workshop followed by an individual training
  session. After the individual meeting(s), users may access
  equipment in the Studio independently. The 3D Printing Studio
  service is popular across campus. During early implementation, 50
  users have attended training workshops. 3D users have
  experimented in the Studio with projects for advanced coursework
  and independent research. It is expected that the number of
  trained users will double in the near future. An evaluation of
  our management policies suggests that providing an open access
  environment and permitting users to experiment independently in
  the 3D Printing Studio contributes greatly to the success of the
  service. We also present ideas for future improvements to the 3D
  Studio service.

  http://bit.ly/19lo3x9

FYI

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ELM