This is a 14 drill bit holder. It was designed for spade bits and I wanted to be able to slide the entire shank of the bits into the holder, so the holes pass all the way through the holder. Though I only have the bits slid partway in in the example photos.
Example photos were printed with black PETG, 0.20mm layer height and 100% infill.
The author hasn't provided the model origin yet.