This is a reproduction of the Vettweiss-Froitzheim dice tower (https://en.wikipedia.org/wiki/Vettweiss-Froitzheim_Dice_Tower), found not far from Cologne. The original was likely made as a commemorative gift in the 4th century AD.
I put it together by just gluing around the edges. Another, possibly better, approach might be to assemble the whole thing in software and print as a single piece, if you've got a big enough printer.
rdtfront.stl | 305.4KB | |
rdtside1.stl | 1.9MB | |
rdtside2.stl | 1.9MB | |
rdtside3.stl | 2.1MB | |
rdtsteps.stl | 34.2KB |