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I’ve read that Rolls Royce is going to be using 3D metal printing on their upcoming Advance3 engine. If it’s good enough for those operating conditions then it should be good enough for anything.

Supercars aren’t exactly known for their reliability. I imagine Porsche would use this on their super and hyper cars first.

Powdered metal camshaft lobes have been in wide use in production vehicles for several decades.

Powdered metal parts are everywhere today, but it's not really an additive process - you pour a bunch of powder into a mold, compact it, and then bake it.

PM parts are also porous and fairly weak (in some dimensions) relative to machined counterparts, so you don't typically see them in critical applications.

Yeah, now that you mention it, camshafts have quite a reputation for fragility. I always wondered how a rod of solid steel could fracture like that.