These are pieces for Settlers of Catan. The Settlement can fit under the City for those who make their own rules and want to have 'SuperCities'. The Wall fits around the City. The Metropolis is for Cities and Knights, and is a flag that fits into a hole in the top of the City piece. The road is just a road. These are the first things I have ever tried to get printed on a 3D printer. The printer I use is at the local library, and it is on the fritz, so none have been printed yet, so I have no idea if they work or how they fit on a board. Regardless of how they turn out, I'll update this to let you know. I plan on doing a Robber, a Barbarian, Ships and other pieces in the future, once I see how my first few things turn out. Cheers, 3point14ratNothing needs to be done except trim out the bottom cross pieces on the Wall so that it can sit over top of the City. Since I have yet to get all of them printed, I don't actually know how good these will work on a board during play. Hopefully in a few days I'll get a look at them. Until then, print at your own risk.