Because printers are a mix of mechanical and electronic components that have to work together to put something very small and physical on another random physical surface and do this with very small movements.
There is nothing in your house that does the same It is a miracle they work as well as they do. It takes tiny liquid dots and puts them with microscopic precision exactly in the right spot on a surface you give them.
And it almost always works. Even without using vendor approved paper, in a relatively dusty environment they continue to work their magic. And they are so well build and easy to maintain that you don’t even need years to learn how to use them, you just buy them and plug them in.
We are quite good at making things small, but printers still need to print on an A4 surface, so they will always be relatively large. But the biggest issue is all the moving parts, from feeding the paper through the machine to positioning the nozzle where the ink comes out.
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