Consider everyday things around you: smartphones, laptops, etc. None of these can be 3dprinted. Things you can 3d print are... smartphone cover, smartphone stand... things you can afford to be plastic in its entirety. I think you guys are overestimating what 3dprinters are capable of. There's a lot of tinkering required to create anything of even moderate complication. And it's almost always cheaper to just buy it if it's available at the store, because the printer costs and the consumables (pla, abs or whatever filament) costs, and time costs.