Underhood Mount For Smoke Signal Detector

The [Smoke Signal was a Kickstarter](https://www.kickstarter.com/projects/1064868871/smoke-signal-a-safety-system-for-3d-printers) project about a year ago. It's just a smoke detector wired to a power cut-off switch intended for [use with 3D printers](http://3dprint.com/18064/smoke-signal-3d-print-fire/),

Rather than having the sensor sitting near the printer, I wanted it mounted inside the [hood](http://www.thingiverse.com/thing:23386) of my Replicator, but I also wanted it removable so tha