There are no more openings at the graduate (PhD, MS) level for the academic year beginning Fall 2015. There may be openings for the academic year beginning Fall 2016, the applications for which open around September this year. These applications must be submitted directly through the graduate school. There may be positions available at the post-doctoral level. To inquire, send an email to 3D3A@princeton.edu.
The 3D3A Lab is also looking for lab technicians with experience in audio, programming, and computer support (primarily for Macs). See the full job posting here. Applications should be submitted via the job posting.
(Updated February 20, 2015)