About two years ago, I downloaded a cellphone holder that I found very useful, two weeks ago I was looking for that specific cellphone desk holder and I can't find it anymore, so basically I made the same design.
it works for phablets, phones, tablets, picture frames, credit cards, checks, knives, shoes... well, you get the idea, it works for lots of things but specifically was made for cell phones.
P.S. Don't play with knives.
1.- Print with 0.4 nozzle.
2.- Don't stare at the printer while printing, it may take forever.
3.- No supports needed.
4.- Any kind of filament works fine.