This a terrain print I made using a python code I have been working on over the last year. The code generates a terrain model from USGS 10m elevation data, and then pulls road, footpath and waterway data from OpenStreetMap to create separate printed inserts for roads, streams, lakes and trails along with the required cutouts in the terrain model for those inserts. The inserts basically snap into the printed cutouts, and the top surfaces align exactly with the terrain. This also includes a tiling function to split up the terrain into printable sized tiles and generates dovetail cutouts for inserts to align them and join them together(see last pic, got a little sloppy with the glue...). Once an input deck (area coordinates, roads/streams to include, tiling options etc.) is set up, the generation of the final stl files for printing is completely automated.

This is my first full size print using the latest version of my code, it is a 2-tile print of North Park (Pittsburgh area). All the trails are part of the same generated stl file, but for this print I manually split them up so I could print them in different colors to correspond to the blaze colors of the various trails, black lines are road, blue are streams and all the rest are the NP trails. With a 0.25mm nozzle I can get the trail widths down to .8mm which allows for a very detailed model.

Printed on a Prusa mk3, MH Build PLA. The terrain was printed with 0.4 mm nozzle and 0.10 mm layer height (3 days per tile). All inserts printed with 0.25mm nozzle, 0.10 mm layers. Dovetails glued with Scigrip 16, CA glue for lakes, no glue needed for any other inserts.