3d city-improvements (cities & knights)

During the process of making a storage box for the cities & knights expansion (http://www.thingiverse.com/thing:1254404), I realised, that the city-improvement cards from the original game won't fit into the storage. So I designed my own 3d city-improvement pieces. There are 3 hex-tiles you need to print (with the possiblity to add magnets) for each player (politics, science and trading) and the five improvement-buildings for that hex. Print the hex and it's buildings in the same color, so you c