Hi folks
I've been working through learning sketchup and decided to apply some to a model that I want to have 3D printed.
Its a 1920s gravity gas pump. I've modelled the main body so far and wanted to test its properties. I built it in sketchup at 1:1 scale as I know that using curves at small scale sizes can have issues.

I then ran solid inspector plugin and ran a .stl through netfabb (free version) and that all came back all clear with no holes. So I thought that I would scale it down (in this case its scale is 1:48) once scaled down to the correct height, I thought I'd run it through solid inspector and netfabb at its new size, however now its showing 4 or 5 errors? I have made the model to quite tight tolerances in certain places, but these were in line with the minimum dimensions that Shapeways require for their FUD material.

Would this be down to the limitations of sketchup at such small sizes or is it a real error that'll need fixing? I have uploaded the pump to shapeways website and it passed their upload tests, but that doesn't always mean it'll print correctly!

I've attached the 1:1 watertight file and the 1:48 error file

1:1

1:48

Thanks for looking
Dave