I love this phone stand by @Josh-3D and I've been making them for my family and friends.
I designed these TPU socks for the feet to give them some grip on the desk and to remove the plastic scraping sound when the phone stand does slide on the desk.
The amount of grip will depend on the filament used - the standard 95A shore hardness TPU will be better than just bare PLA but the softer compounds will be better.
I tried to match the aesthetic of the phone stand, and tried for similarly dramatic photos!
They should slip on easily but snug (this was the 4th iteration as all the earlier ones could be peeled off too easily).