I'd say precision. We need mature manufacturing processes for home printers so they can be mechanically precise enough to create everything. A lot of it is just that the hardware is immature, and needs a few more years of finer grained manipulation development in both the printer design itself and the resulting printers capabilities.
I mean, the precision extreme is that you can have a printer that arranges matter on a molecular scale. That is what Star Trek esque food processors are conceptualized as. If we can't get molecular, we should at least try as hard as possible to make it happen (though considering we are on a mm scale now, getting to the 0.1 nm or 100 pm scale (where a hydrogen atom is around) might take some time).
I'd say precision. We need mature manufacturing processes for home printers so they can be mechanically precise enough to create everything. A lot of it is just that the hardware is immature, and needs a few more years of finer grained manipulation development in both the printer design itself and the resulting printers capabilities.
I mean, the precision extreme is that you can have a printer that arranges matter on a molecular scale. That is what Star Trek esque food processors are conceptualized as. If we can't get molecular, we should at least try as hard as possible to make it happen (though considering we are on a mm scale now, getting to the 0.1 nm or 100 pm scale (where a hydrogen atom is around) might take some time).