While I really liked buho29's 3 Jaw Chuck, it lacked a mounting system. So I rebuilt close to it in Fusion 360, and changed the base plate to have a 7.2 mm hole to take my small power tool. Then I changed the holes to take 3 instead of 2 screws to allow a sturdier connection.
Lastly, I made alternate jaws and put markings on each as well as the chuck.
The jaws can't be swapped with buho's design.
v1: first complete rendition
v1.1: changed backplate mounting holes to 2 mm, mount changed from 7.2 to 7.4 mm, thickened central shaft, more regular knurling, pin holes for 1mm wire allowing to tighten the vise better