3d printers are a tool. They are suited to very specific types of fabrication and prototyping. They are not categorically different from a stick welder or a table saw or a sewing machine.
If you buy one because you like the abstract idea of owning a 3d printer, the most likely outcome is printing knicknacks for a few months, then having it sit in a corner collecting dust. I recommend against that!
Now, if you already often find yourself thinking "hm, in this application I really wish I could print a specific component", then, maybe? But also, first consider commercial print-on-demand services, or asking folks in your community to run the part off for you.
I love my printer. At the same time, it's another tool, not a revolution in the way I relate to manufacturing or products.
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