Nail Holder for tapping in nails for string art projects, etc

My daughter and wife have been making string art projects for kids in the special needs community. They have to hammer in hundreds of small nails fairly straight and accurately placed. I came up with this nail holder that allows good visibility and stands the nail up straight for tapping in the wood.

I printed in PLA with no supports, plenty of spring to hold the nail. Easy to pinch the back to get the holder off the nail.

Small, medium, large and extra large nail diameters. I use the small for #14 box nails shown above which are about 2.2mm in diameter.

Parameterized Fusion 360 CAD model include so you can make remixes.