Robo 3d R1 Plus Camera Mount Remix

Just a remix of Thing 890584 to add a center pin so that it's centered on the bed.

I noticed that Thing 890584 on my bed didn't allow the bed to rest completely down on the magnets so I reduced the thickness of the bed clip so the bed makes full contact with the forward magnets.

I also reduced the height of the front two clips as with the bed fully slid forward the right clip was hitting the limit switch.

I am using the Logitech C270 on this mount http://www.thingiverse.com/thing:141396