Automatic printing of items doesn't create a post-scarcity world.
The printing machines can only print from plans. People who create those plans may sell them, and those plans may be pirated, but there's still industry. There's still supply and demand.
If nobody is compensated for the manufacture of the plans, you're either on your own to create them or perhaps they'll be donated. Given the state of charity in the world, one can assume that they won't be donated, but given the state of open source, one might assume that they will. Regardless, the plans aren't self-creating and/or limitless.
Why would the governments supply the raw materials for you to purchase a car? If they aren't currently motivated to just buy you a car, why would they be suddenly motivated to pay for all the materials that go into a car's manufacture, even if the labor cost is reduced? If the materials were free, what's to stop everyone from printing out 20 different types of cars and luxury mansions?
The printing machines can only print from plans. People who create those plans may sell them, and those plans may be pirated, but there's still industry. There's still supply and demand.
If nobody is compensated for the manufacture of the plans, you're either on your own to create them or perhaps they'll be donated. Given the state of charity in the world, one can assume that they won't be donated, but given the state of open source, one might assume that they will. Regardless, the plans aren't self-creating and/or limitless.
Why would the governments supply the raw materials for you to purchase a car? If they aren't currently motivated to just buy you a car, why would they be suddenly motivated to pay for all the materials that go into a car's manufacture, even if the labor cost is reduced? If the materials were free, what's to stop everyone from printing out 20 different types of cars and luxury mansions?