Of course, we’re talking strong materials here. From what I know, it’s things like nylon, PETG, or even metal if it’s parts that take on serious loads. For small-scale production, I’d suggest checking out Epitum 3D printers at epitum3d.com, they support printing with nylon, all kinds of plastics, including metal-filled and engineering-grade ones. And the best part, in my opinion, is that these 3D printers are basically industrial-level, but the price is something a small or medium-sized business can actually handle.