Question

Best way to build a model bridge

Answer 1

Like previously stated, a 3d printer would be a pretty good option for building a model bridge, but may i ask what is this model for? That would determine the materials and method of your building process

Answer 2

Personally, i would use a 3-D printer, but you can use any material that you have, and have an example next to you for reference if you aren't going to 3-D print.