Thanks for the advice!
After digging around, I found that somebody else has done a project similar to mine, to get a basic understanding of it see this link:
https://www.shapeways.com/model/338996/sixaxis_bionic_dock__f ixed_.html?gid=mg
However, there are two areas in which I would like to expand upon. First, I would like it to be more portable. My first thought was to make the clamp fold up, but I recently came up with another approach, to have the clamp detachable with a dock at the bottom of the device to hold the clamp arm. I basically want to be able to toss the dock + controller combination into my bag without any protruding parts sticking out and potentially breaking from everyday wear and tear.
I'm assuming in this application a living hinge would not be appropriate? I did some searching through the help files and found that incorporated hinges, where they are printed as they are with no external pieces, is a possibility. Perhaps that would be the simplest approach. Do you know of any examples of such heavy incorporated hinges floating around the stores?
The second area I would like to expand upon is to make the dock universal. I was thinking of using a telescoping arm to do this, with the locking mechanism being a screw attached to the outer sleeve that you would tighten to prevent the inner arm from sliding. See diagram 1 to get a better idea of what I'm talking about, the cylinder at the bottom is the screw.
As for fasteners, if you look at the front of the 3d model on the link I provided, you'll notice that its blank, while on the photos the person who made it did something to fasten it around the controller. What I was thinking of doing is having a fastener with a natural catch, see diagram number 2 for a better idea.
What I would still like to know is, what is the most robust material that can handle moving parts, and what kind of distances should I allow for when modeling? I know there's lots of discussion about integrated moving parts, so the distances on the hinge is probably well-covered (as long as I can see a good hinge design to allow for cleaning) but what I would like to know is what about the telescoping arm? It is my intention to print the sleeve and the inner arm as separate pieces, should there be any gap at all between the pieces if there's no threat of them fusing in printing? Should I still allow a gap? What about the use of the screw? should I try using a printed plastic screw, or would I be better off having an unthreaded hole and simply jamming a screw in the hole? How big of a hole should it be relative to the metal screw?
Anyway, thanks for your time. Still want to hear some solid advice before I start hammering out the details on this.