Toy Train Flatbed Car

Flatbed train car for my toy train: https://www.thingiverse.com/thing:2556019

UPDATE

10/12/17 Version 2 uploaded. Version 2 has a re-designed wheel and axle that are more robust and kid friendly. It features improved looks and less resistive wheel movement.

5/4/2019 I uploaded stl files for printing single wheels, in case anybody didn't want to print them together, or wanted to use a different axle.