Looking rather nice for a generic locomotive, I'm sure sure a product will be appreciated.
If you are looking at getting it printed, it's worth noting each part has to be a certain thickness in order to be produced. At least with Shapeways anyway, who seem to be quite reliable. I'd imagine it's the same with other companies offering similar services too.
I agree entirely - best to get the faults fixed - especially if they are making you not want to run your railway. We found all sorts of errors on our track when we took the calipers to it. I've really got no idea just how some of them were created, but created they were.
It's always painful to re-do stuff like this but I reckon it probably gets more painful the later you leave it because you'll probably have invested even more work that will get damaged or destroyed.
Andy