The internet was a revolution, starting with a few networked government buildings.
Mobile phones were a revolution, starting with heavy briefcases that barely worked anywhere.
Computers were a revolution, starting with speeds so slow a human could keep up.
None of these revolutions happened overnight.
3D printers will become cheaper and will become common place so slowly, we won't even notice it until only in hindsight we will say "it was a revolution".
It may take another 20 years to get there, but we will.