I printed the Shipbuilderbetterfit file in PLA. The central axis hole is a little loose. The parts tend to spin around a bit and there is not enough friction to keep the ends in place. I folded the ends of the filament to wedge the end pieces on. The holes on the girder-like pieces just needed a little reaming with an x-acto. Those parts hold together well. Also, the side holes on the cylindrical parts fit well. I couldn't get the filament into the two smaller holes on the engine section.
Overall, I like the idea and enjoyed putting this together. I used glow in the dark filament to hold it together, so I'm looking forward to seeing how that will look. Nice work. I'm looking forward to your add-ons.
Wow, I really like the design! How did the fit work for you?