I designed this ultra-foldable phone & tablet stand that fits every size. I have a smartphone with a back cover and a 10.5 inches tablet with back and front cover: this stand keeps in place both, and once I don't need it anymore, it folds and fits a pocket.
It's made of two parts, and once you have printed both you just need to join them while keeping them straight, just like shown in the photo.

TEVO

Tornado

No

No

0,4

20-30%