These open top tear drop cargo trailers resemble those used by U-Haul years ago. These are designed for printing in White Strong and Flexible for a lower cost. I also have a FUD version available at a higher cost, but also a better finish. This material (SWF) is slightly rough and porous.
I haven't test printed this model yet, but I THINK it will print OK.
All models arrive unpainted shipped direct from Shapeways. Most have to be cleaned prior to painting. You can get more information at my website:
Dave's Model Railway Stuff (www.davesmrs.com).