Treating printing as a manufacturing process rather than a prototyping convenience means accepting that the build is one step in a chain, and usually not the longest or most expensive one. What separates a printed prototype from a printed production part is everything that happens around the machine.
File preparation is a controlled step
Orientation, support strategy, nesting and slicing all affect the finished part, so in production they are fixed and documented rather than decided per build. A production part has a build file that is version controlled exactly as a machining programme is, because changing the orientation changes the properties, and an undocumented change is an unrecorded engineering change.
The build and its monitoring
Machine calibration, powder or resin lot, chamber atmosphere and in process monitoring are all part of the record. Modern metal machines log melt pool behaviour layer by layer, which is what allows an anomaly to be traced to a location in a part. That data is the closest thing additive has to non destructive inspection during manufacture.
Post processing is the long pole
Depowdering or washing, stress relief, part removal, support removal, heat treatment, hot isostatic pressing where required, machining of critical features, surface finishing and cleaning. Each is a step with its own record. In metals this chain routinely costs more than the build, and it is where most of the lead time lives.
Qualification and why it is the real barrier
Because properties depend on parameters, orientation, powder lot and post processing, an additive part is a process rather than a shape. Qualifying it means witness coupons, destructive testing, documented parameters and change control. That is why regulated sectors moved carefully and why substituting a printed part for a machined one is never simply a purchasing decision.
Questions people ask about 3d printing manufacturing process
Is 3D printing a real production process?
Yes, in the applications that suit it, under a qualified and documented process. It is not a drop in substitution for machining or moulding.
What is the most expensive step?
In metals, post processing. Stress relief, support removal, heat treatment, machining and inspection routinely exceed the cost of the build.
Why does build orientation need controlling?
Because it changes properties, accuracy and surface finish. In production it is fixed in a version controlled build file rather than chosen per build.
What makes qualification hard?
Properties depend on parameters, orientation, powder lot and post processing, so the process rather than the part has to be qualified, with coupons and documented control.