Phase3D raises $2.9 million to scale in-situ print inspection

Phase3D raised $2.9 million in an oversubscribed round led by Quest Venture Partners as it pushes Fringe Inspection deeper into industrial metal printing. The bet is on a blunt but expensive problem familiar to anyone who has watched a build go wrong late: catch the defect while the part is still growing, not after hours of machine time are gone.

Fringe Inspection uses structured light metrology to measure the 3D surface profile of every layer during a build. Phase3D has positioned the system as a repeatable, unit-based alternative to the subjective visual and thermal monitoring methods that have long made in-situ inspection feel more like a guess than a measurement. By plugging directly into printers rather than forcing a separate quality-control workflow, it is aimed at the part of metal additive manufacturing where reliability and proof matter most.

The company says the system works with most industrial-scale metal machines, including powder bed fusion, metal binder jetting and cold spray platforms. That broad compatibility is part of the appeal for a market trying to move from prototypes to production, where users need better ways to qualify parts and materials, train operators and document what happened inside a build long before the powder is unpacked.

Phase3D also already has a footprint in highly regulated work. It has worked with the U.S. Air Force, U.S. Navy and NASA, and incoming board member Ray Farrell pointed to the company’s early customer traction and its reach across aerospace, automotive, military and NASA programs as reasons it stands out.

The new capital follows a steady push outward. In September 2025, Phase3D announced a Fringe Inspection M2 Series 5 Kit for Colibrium Additive’s M2 Series 5 metal printer, saying the work was helped by ASTRO America’s Actionable In-Situ Awareness Challenge. The company launched an online store for Fringe Inspection software in June 2025 and announced a partnership with Taiyo Nippon Sanso Corporation in February 2025, extending its commercial reach into Japan.

In February 2026, CEO Niall O’Dowd said post-process inspection can account for more than half the cost of a qualified metal AM part, and that some large aerospace components make post-process inspection physically impossible. That is the logic behind this round: if a long build can fail on a hidden deviation, the next step for metal AM is not just faster printers, but better eyes inside the printer while the part is still being made.