I found this S-Scale Jeep design that looked perfect for my Military flatcars, with a few mods and a scale change, it became an O-scale Jeep. It's actually printed in a total of five colors, two different shades of green to make the canvas top contrast with the body, the seats, the tires, and the white inserts for the star and circle. All the parts snap together, the only glue is the chassis to the frame and the white star, everything else is a press or snap fit. One change was to remove all the straps between each part and the frame all around all the parts. That seemed like just extra printing/time for no real purpose. With the right settings, the individual parts stick to the build plate just fine, so no extra help needed. I also printed this single sample with a brim, but it was a PITA to clean off the brim, so that was dispensed with as well.
I liked how it came out, so I'm going to print at least 20 more of them for a bunch of flatcars. Here's six on the factory floor. I slowed the print way down from the printer's max speed to try to enhance the quality of the print, so this printed overnight. It's close to done and about to come off the press. I'll fire up another six chassis/body prints and head off to the Oaks Train Show, it's setup day for the NPOG modular train club.
I have all the other parts already printed, so once I have chassis parts, I can start the Jeep production line.