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I think it really depends. 3D printing allows you to be CAD lazy. Things don’t need to make sense as long as the interface is correct. You can also print another part if you mess up. You need to spend some time to make sure CNC parts are engineering sound. But most “experienced” and respectable engineers know their way around the shop. I have zero issues using a manual/CNC mill, grinders, brakes, or drill press. I did it all the time when the schedule is tight, my electrical engineer counter parts would order some off the shelf parts and I’ll modify it for the projects needs.