Drill Hole Guide 1-12mm with V-Groove
This is a variant of http://www.thingiverse.com/thing:929982 with a 45 degree V groove so you can drill at the center of spheres, or drill at a 45 degree angle onto edges.
This is a variant of http://www.thingiverse.com/thing:929982 with a 45 degree V groove so you can drill at the center of spheres, or drill at a 45 degree angle onto edges.