K8200 X axis belt tensioner V2

Optimized X axis belt tensioner for my new K8200 printer.

Originally derived from http://www.thingiverse.com/thing:13479

For V2 I refined the design again: Now the belt runs perfectly parallel.

Because this design is also a little flatter than the other you can reuse the two screws from the original belt clamp ( without the toothed washers ), so you will only need one additional M4 nut + screw ( about 30-50 mm long ) for the ram mechanism.