Also, if I wanted to 3d Print casing, what material should I use for the safest and sturdiest method? Is 3d Printing buttons worth it or not?
If you want to start doing portablizing, then IMO the best way is to learn basic electronic skills like what
@fibbef was saying, and also go through the Guide hub and forums. READ EVERYTHING. The more research you do, the less likely you will mess something up. If you are having a problem chances are that someone has already had that problem and figured out how to solve it.
The number one thing in making a portable is research and design. The more you do of both, then the better your portable will be.
On another note, don't worry it's it's not perfect your first time. My motto: make it work, then make it right.
As far as 3d printing goes, I use PLA for basically everything. ABS is a great plastic as well but for building a case, you can end up having lots of issues with warping. PLA is plenty strong and as long as you do your ventilation and cooling right will work fine for everything.
I personally like printing off buttons because you have much more flexibility in both design and aesthetics. If my button doesn't fit just right, I can change the design rather than buying a new controller and gutting it for it's buttons. If you know how to do some post-work on 3d parts, you can basically make great buttons that are just as good as the original (in my opinion)
Welcome to the community!