I don't even think the extrusions are that expensive. What really shocked me was that I paid more for the fasteners than for the extrusions themselves. And you're right! I don't even need a 3D printer. It's basically just about building one and thinking of/ designing/ printing new improvements to the printer.
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You'll learn a lot more about 3D printers (and how to repair them) because you built your own. I built my CNC machine and have been able to quickly repair it because I assembled it.
Don't let anyone tell you that you don't need a 3d printer! I've made enough money to pay for my printer doing various jobs I've picked up because of having one.
That's awesome :)