Đế giữ điện thoại hình cuốn sách

First, a shout-out to whoever came up with the “sticky Note” phone holder. I based this on that. 
Surprisingly, this works quite well. It holds my Android XL phone with a case, no problem. (couldn't place the phone and take a picture of that phone because it's the only phone I have, so….)
There are two versions, a plain one and one with the words. The .3mf includes “adaptive layers”. You do not need a multi-color printer for the plain one, as it's just a layer-based color change. The one with words I think needs a prime tower.
I have a metal shelf top, so I included an image using a 25mm x 4mm negative part in the slicer for magnets.