1) It depends on what hall you’re discussing. In the Quad, almost all of the suite bathrooms are shared by 4 people (2 in each room). In Barton, all of the suite bathrooms are shared by 6 people (3 in each room). As far as I know, each suite bathroom (no matter where) has only 1 toilet stall, 1 shower, and 1 sink. Good question.
2) Yes, you can use floor bathrooms whenever you want.
Printing) I believe that the Quad is the only freshmen residence hall without an in-house printer. However, to clarify, there are printers all over campus not just at the “computer lab” (which you are probably referring to the Voorhees Computing Center (VCC). There are also computer labs all over campus. For a full list of public printers that students can use, take a look at this: http://helpdesk.rpi.edu/update.do?artcenterkey=301 . You should recognize some of those as names of the freshmen residence halls!
Freshman year roommate) When I was admitted two years ago, there was an admitted students site operated by RPI. If you’re not aware of this, they’ve probably done away with it (and moved to Facebook). This is where we went to find out (electronically) if we had been admitted, and we each had a profile. There were forums and chat rooms, etc. I found a guy on there who had similar interests as me and we made the arrangements. If this doesn’t exist, I would encourage you to make use of the RPI Class of 2015 Facebook group. Perhaps you could organize something off of this and get things moving?