Arch Bridge

I remodeled ErikHK's arch bridge (https://www.thingiverse.com/thing:318816) for two reasons. One, I wanted the pieces to have rounded edges, and two, I wanted to have each piece as a separate stl I could arrange how I wanted on the print bed. I also felt it was a bit redundant to have 5 of the exact same piece in a model, and so distantly spread out in the print layout.