I made @TheGoofy's "Yet ANOTHER Machine Vise", but those who have been following my other creations know that I am LAZY.
I created an adapter that fits into the hollow vise handle, and provides a bit for connecting a power drill. Now, you can use a drill to open/close the vise! I suggest using the drill on low torque/low speed.
See it in action here: https://youtu.be/_xQqyeATnvg
I would suggest printing Z-axis layers 0 - 15.0 mm at 25% infill. Then from layers 15.0 - 50.0 at 75% so that the hexagonal stem has more strength. In Simplify3D, you can do this by creating two processes, one for the bottom section at 25% infill, and a second process for the top section at 75% infill.
A tutorial by Maker's Muse for doing this here: www.youtube.com/watch?v=OcddlK36OVs