While printing it is recommended do not use supports just bridging. For dual color print I changed color:
on height 5.2mm and 5.8mm for part 1 (aShoeKlips3_p1xxx)
on height 8.2mm and 8.8mm for part 2 (aShoeKlips3_p2xxx)
Update:
05.05.2018 Added revision D for better bridges slicing. Check images.
Also rev D has 0.6 chamfer for top holes instead of 0.4 like in previous revisions
aShoeKlips3_p1d.stl
aShoeKlips3_p2d.stl