This paint rack is meant to hold traditional hobby paint bottles and can be mounted to the wall using size 8 screws. There is a small "clamp" at the end to hold the bottle cap in place to prevent wiggling and falling out.

I'm not quite sure why the preview on Thingiverse shows the file sideways. Obviously you would want to print them in the orientation indicated in the Fusion 360 screenshot.

I made this after seeing bigunwhistle's hex rack but wanted to make a few improvements such as making the tubes taller, having the sides open to save filament, incorporating mounting holes, and including the "cap clamp". Please give his a view as well! https://www.thingiverse.com/thing:2701836

I have also created a link to the original Fusion 360 File for anyone who would like to edit to their liking. Enjoy! https://a360.co/2mpIDKK