This is just a simple camera web cam mount. It slips onto the aluminum bed to allow the camera to move with the bed keeping the distance the same while shooting time-lapse videos of your prints. I designed it for a 2mm thick aluminum plate.

It requires a square 1/4 20 nut and threaded 1/4 20 rod. I designed the pocket tight and filed util it fit in tightly.

These are the square nuts I used : http://amzn.to/1XnqOWR

the 1/4 20 threaded rod can be purchased at any home improvement store

UPDATE :: So while this works the design amplifies any Y axis vibrations. It does not affect the print but the camera vibrates... I'm going to look at what I can do to dampen this this week...