Printed on PrintRBot Plus in about an hour. 2 perimeters, 2 layers top and bottom. Infill at 20%. Oriented with big hole flat to the platform. See photo.
Vise mounting does not need the pinch bolt.
Run the #6 x 1-1/2 screw thru to clear the hole. Back up screw, drop the nut in and thread screw into nut. Insert Dremel and tighten the screw. Snug the screw. Crank too hard may crush plastic.
Flange holes take #8 x 3/4 sheet metal screws. Mount on a 2 x 4, 1 x 4 or anything else. Flange could be C clamped to edge of table.