This is 3D printable mobile welding generator set.It usually pulled behind small field maintenance car around the working area.
It is originally build for HO (1/87) scale, but surely you can blown it up to any scale you like.In HO scale and other tin scale it's strongly recommended you print it in SLA or DLP 3D printer instead of FDM. Because you can't get those tiny detail with FDM printer.