you need to pay for the materials for that 3d printer.. and you need electricity for that 3d printer.. and if that printer breaks and u dont know how to fix it? you need something of value to trade with someone who does know how to fix it for you (a medium of exchange/"money"). What is the car going to run on? Are you going to mine for oil yourself and then turn it into gas? or is the 3d printer going to print you a solar powered car? etc... so yeah, I think you'll still be needing some sort of medium of exchange and way of providing value to others in order to get that. :)
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There is a better way. You'll see. I've figured it out already...And I played every scenario in my head on how to make it work. ;)