Robo 3D bed mounted camera arm

I was using the camera mount from http://www.thingiverse.com/thing:1006864 which worked great. Until I added a dual fan modification. That mount centers the camera on the bed, so when you have a fan in front of the camera and print in the center of the bed, you get an excellent view or video of the fan.

In this re-mix (more of a reimplementation inspired by), I move the arm off to the far right side of the bed. I also change the top mounting plate to be a separate piece, so it can be pointed toward the center of the bed and be adjustable. The picture of the dual fan and nozzle is an Octoprint screen capture of the view from the mounted camera when the nozzle is at the center of the bed.

The arm has an M6 captive nut, so you'll have to pause the print at the appropriate point to add the nut. After printing, use an M6 bolt to attach the top plate to the arm. Use a bolt and the existing screw hole in the right front of the mount to attach the arm to the bed. I reused