This is a 28mm scale German O tracked cargo vehicle, suitable for use in with the Bolt Action gaming rules. Is is listed in the German Army book.
I started with the 1/200th scale O from Bergman's large collection (pack # 2 - Once upscaled to 28mm (1/56th), it lacked detail, so I added detailed track links stamped wheels and hubs for the suspeion road wheels windshield wipe, radiator grill, head light recesses, door handles a tow hook a removable cargo area cover I also "cut off" the tracks from the original one piece print; and made each track piece a separate file. I do not think you can print a proper tracked vehicle at this scale without making the tracks separate files, and printing them on their side. Please make sure you use supports in setting your print settings.