Process stability and control are of great importance in laser metal deposition: Ideally, abnormalities and deviations in the process must be immediately addressed without delay to prevent interrupting the process. This is where systems for machine-integrated monitoring are needed – they can check such processes directly on the spot and initiate corrections. Together with its industrial and research partners, the Fraunhofer Institute for Production Technology IPT has, therefore, integrated the imaging inspection method optical coherence tomography (OCT) into a coaxial process for wire-based laser metal deposition, or LMD-w. The new OCT measurement methodology can not only record the welding process in progress, but also control the quality and process during use, reducing scrap. LMD-w can, thus, be used as a fully-fledged 3D printing process in the future.