Simple City. Two base types. Square one and the puzzle. Puzzles group consists of regular one, the edge and the corner. You can rotate and fit them together (for respective kind) and make larger patterns. I have prepared them with three different tolerances (for different scale prints). Let me know in the comments if designing different kind of puzzles (with empty space, park, wider street, crossroads, stadium etc.) will make sense. Then I can design them. You can print without infill (depending on scale) nor support (obviously). WARNING! Be careful with taking out of the heatbed.