@Alexander @ciclopez, you have a point, we're exploring alternative ways to open cities and are taking all the above comments in consideration. The current model also has some advantages:
[*]people have more choice in materials, colors, size, accuracy, etc.[*]people local alternatives/backup when that printer breaks down or the owner goes on a holiday
Of course in the long run each registered printer should be active, independent of where they are based. Our next step is to have a lower number of required printers in smaller cities and we're preparing our platform for this change.