A scaled-down version of my HO Arrowedge, I've increased some of the wall thicknesses to ensure it prints ok and is reasonably resilient when handling. Now added some internal cross-beams as well. Circus City Decals and Graphics have produced a set of decals for this model in N and HO scales.
https://circusdecals.ecwid.com/#!/~/search/keywords=arrowedge&offset=0&sort=relevance