The Internet (from "The IT Crowd")

Careful with this.. it's the Internet. As seen in this scene from UK sitcom The IT Crowd in which a pair of mischievous IT workers play a prank on their tech-illiterate manager.

3D printing is really not the best way to build a full-size working replica of the prop, as the original was made with cheap off-the-shelf parts and there's already a great Instructable with all the info you need to build your own. Though this copy is modelled at full-size, I imagine it being much more useful for scaling down and printing as a desk toy or prop for action figures, dioramas, and such. The ones in my photos are printed at 1:6 and 1:12 scale.

This model is primarily based on measurements gleaned from that Instructable, many thanks to author Melty Mcface for doing the work.

2020 update: Gr_h_m L_n_h_n is a bigot and a jerk. Trans rights are human rights.