Machining vs 3D printing
Both techniques make parts, but rarely for the same reasons or with the same results.
Two opposite manufacturing logics
3D printing builds a part layer by layer from material added progressively, allowing complex geometries hard to achieve otherwise, at a low unit cost. Machining, conversely, removes material from a solid block, generally giving better dimensional precision and higher mechanical strength, at a often higher cost.
Which process to choose depending on the part
A plastic part under light mechanical stress, with a complex geometry, works well with 3D printing. A metal part under strong stress, or requiring very precise tolerance to assemble with other elements, leans more towards machining. The choice always depends on the part's real use, not a general preference for one technique or the other.
Frequently asked questions
Is 3D printing always less strong than machining?
Generally for high mechanical stress, yes, but it remains largely sufficient for many everyday uses.
Can both techniques be combined on the same object?
Yes, that's common: some parts of an assembly are printed, others machined, depending on their respective function.