This is a primitive 3D printable O scale train bogey. It's not very detailed or realistic but it rolls along the tracks rather smoothly. The top of the bogey features a 9mm peg that you can easily add a hole to on existing 3d files for train vehicles.

You will need to print 4 wheels and 2 trucks. The two pairs of wheels glue together and then are placed between the two trucks before you glue them together. Hope someone is able to get some use out of these files.