Universal Projector Ceiling Mount

I have an HD projector, that I wanted to mount to the ceiling. Problem is, most projector mount are specific, needing a specific mounting plate. So I put this one together, making it generic.

It is inspired by Wade's design, which gave me a great starting point, but needed to be a bit more secure and made generic. The original is here: http://www.thingiverse.com/thing:4146

Firstly, I added a ceiling securing ring which can be used (as an additional item) to add support for particularly