Some of us like light razors, and some of us like heavy razors.
If you come from a vintage SE background where most razors are made from sheet metal or plastic you'll be right at home with 3D-printed razors.
If you come from a modern stainless steel DE background you'll struggle with weight and angle.
(A 120g stainless steel or brass razor used with "gravity" is too much pressure in my book, btw)
With most SE razors there is no need to "choose an angle". Cap flat on the face. Any other angle is wrong. Simples.
Most designers of 3D-printed razors have an SE background as far as I can tell.
My advice: Buy a vintage 1912 or injector first (less hassle, just eBay). If you don't like them, don't bother with 3D-printed.