GE Additive Arcam A2XX

EBM uses a high-power electron beam in a vacuum chamber at elevated temperature, while LPBF uses one or more laser beams in an inert gas atmosphere at near-room temperature. EBM's key advantages are the vacuum environment (no oxygen risk), near-zero residual stress, and faster scan speeds. LPBF offers better surface finish, broader material options, and finer feature resolution. For titanium implants and aerospace parts, EBM is often preferred; for tool steel, aluminum, and fine-feature parts, LPBF is typically chosen.

The A2XX is primarily used with Ti-6Al-4V and Ti-6Al-4V ELI (extra low interstitial, preferred for implants), commercially pure titanium grades, and CoCrMo (cobalt-chrome for orthopedic and dental). The EBM process is not suited to aluminum alloys or most nickel superalloys at standard A2XX build temperatures — the Arcam Spectra H is designed for high-temperature superalloy processing.

The machine itself is not FDA cleared — individual implant designs produced on it must go through FDA 510(k) or PMA pathways. However, numerous orthopedic companies have successfully cleared Ti-6Al-4V EBM implants produced on Arcam systems, and EBM is now an established manufacturing process for FDA-regulated implants. GE Additive provides process documentation support for regulatory submissions.

EBM uses larger powder particle sizes (45–105 µm) and larger beam spot sizes than laser PBF, resulting in coarser layer surfaces. The elevated build temperature also causes some powder particle sintering adjacent to part surfaces, contributing to roughness. For orthopedic implants, this roughness on porous structures is often beneficial for osseointegration, but functional surfaces are typically CNC machined to final tolerances.

The A2XX build volume is 200 x 200 x 380 mm. This cylindrical-to-rectangular envelope is well-suited to stacking multiple implant components per build. For example, a single build can produce dozens of small orthopedic components simultaneously, with build times of 10–40 hours depending on part volume and layer thickness settings.