Smoke Detector Mounting Plates

A couple mounting plates to attach an Atom smoke alarm to aluminum extrusion or a NEMA17 motor. These [tiny smoke detectors*](http://amzn.to/1jW6z4f) are small (40mm diameter) and light enough (43g) to mount on a printer or extruder.

I had some concerns that the plastic fumes would trigger the alarm, but that hasn't been a problem so far. I haven't tried burning plastic to see how sensitive it is.

*Update: The alarm did trigger once when printing transparent ABS. I doesn't seem to tri