This is a 3d printed, radio controlled bulldozer. It is about 200 hours of printing time, zillions of screws, bearings and so on. It has 2 motors, one for each track. And, it has 2 servos lifting the blade up and down. The whole project is CC4-by-nc-sa.
How does it look like: https://www.youtube.com/watch?v=pU6fe7RiBuI
The STLs here contain just the driver cabin. The full set of STLs and a manual for assembling can be found at Github:
3 shells horizontally and vertically, 10% cubic infill for most of the parts, PLA, most parts print without support needed