This is an instructable for building a Girder Railroad Bridge (largely of my own design) in N-Scale or (1:160). The 3D model files can be found on Thingiverse. This bridge is actually intended to be part of an ABT style of Bascule Draw Bridge but I decided to release it as a normal bridge first.
The parts for this model need a with a 250 micron nozzle. You might be able to get away with using a more standard 400 micron nozzle if you dial back the extrusion width but quality will suffer.
Different lengths of bridges can be created with this kit though I only provide two, one of 96 feet in five sections and one of 115 feet in six sections. The latter is the largest that my printers can handle (with a reasonably large bed) and the five section should fit on a lot of smaller printers.
There are two directories that contain the parts for the two sizes of bridges that I mention above though they only include the parts that are length specific. There are three stays or strings that are in the root directory. Speaking of the root directory...you will find the source Sketchup and STL files for each section sized piece of the bridge.
The bridge that I will show being assembled here is actually intended to serve as a draw bridge so one end of the construction will differ from a stand alone bridge!
Here are the parts that you will need...please note them in the above photo!
When you load the parts into your slicer you will have to reduce them to print as I model in full scale! Factor for 1:160 is .625.