M4 X axis belt tensioner
thingiverse
Check out the updated version here: http://www.thingiverse.com/thing:130235 Optimized X axis belt tensioner for my K8200 printer. Derived from http://www.thingiverse.com/thing:13479 M4 screws, screw distance 15mm and I combined the top and trap parts into a single piece. Still prints fine.
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