I created this to mount a camera in my FlashForge Creator Pro. I designed a replacement for the back plate (black plate mounted behind the build plate) that a camera for the Raspberry Pi can mount in and it is angled such that it can see the entire build area. The camera is actually hidden pretty well and I mounted the Raspberry Pi in the bottom of the printer (where the main board is) using a couple of plastic M3 standoffs in a couple of the pre-existing holes. I bought an extra long ribbon cable for the camera to ensure it would reach and it flexes as the bed moves without issues.

I am including 2 versions that I created as well as the OpenSCAD file in case you want to tweak it yourself.

UPDATE 2/26/2017 - I am adding a new version of camera mount that I decided to design, this version mounts in the back left corner (when looking from front) using some double-sided tape (I use 3M VHB type since the chamber gets pretty warm). I included 2 versions, 1 is at a 45 degree angle pointing straight and the other is at a 38 degree angle and also points down 6 degrees. I decided to move away from the back plate which did work fine but due to how close it is to the build plate it only shows part of the build area unless you add a fisheye lens, this was ok for me until now but decided I wanted to improve it. With the camera in the back corner the camera is far enough away that you can see the entire build platform and doesn't get blocked by the extruder assembly as much. I know people have been asking for pics from the camera while mounted but to be honest I always forget to get a pic and I only use the camera to remotely view the build in Octoprint just to make sure things are going ok. I plan to do a few timelapses soon to test that feature and will post one of those after I create one.