It sounds like they're not doing QC/QA, which would be unwise and maybe isn't necessarily true.
While 3D printing allows printing shapes that cannot be forged or cast, testing is always needed as part of the manufacturing process feedback loop. X-ray and dye penetration nondestructive testing check for abnormalities on accessible services, but destructive testing is needed sawing samples into slices to also check them for hidden defects.
While 3D printing allows printing shapes that cannot be forged or cast, testing is always needed as part of the manufacturing process feedback loop. X-ray and dye penetration nondestructive testing check for abnormalities on accessible services, but destructive testing is needed sawing samples into slices to also check them for hidden defects.