The first two files are just reduce the thickness (or remove) the backing from the original Vallejo racks. The third is a simple swap out of the shelf sizing for a slightly larger bottle, (specifically for Privateer Press 18 ml bottles.) The backing for the shelf unit can be found on the original model page by @Stu Cameron
https://www.printables.com/model/210707-vallejo-paint-rack
I really like their simple quick print paint rack, just wanted to save a little time and fit my random other paints.
These racks are compatible with gluing a swatch sample to the top of the bottles for washes, speed paints, contract paints, ect. Well worth the time I think for easier painting.
The author remixed this model.