In-process sensing is a necessity to move from 3D-printing to additive manufacturing. Specifically, there is a need to move from prototyping to manufacturing high quality parts to be used in real designs. To move towards process and material qualification for additively manufactured parts, the laser powder bed fusion (L-PBF) process must be monitored for a variety of defects throughout the building process. EWI has made major progress in this area through the evaluation of multiple state of the art sensors on an open architecture L-PBF Test Bed. Sensors included local, global, and passive devices ranging from thermal melt pool monitors and spectrometers to laser profilometers and acoustic sensors. Sensors were evaluated for their inherent capabilities in detecting build contamination, defects, and process variations of varying magnitudes. Results show that a suite of sensors, rather than a single sensor type, will be required to fully qualify the process in the future.