Hey guys,

I'm pretty new to 3D printing and am wondering if anyone can advise on the best filament to use for a bridge-like structure. It's a structure about an inch thick, 4 inches wide, and 6 feet long (it will be printed in sections and then fused together). It will have a lattice structure that is designed to allow flex, but I'd like to print it with a filament that meets 3 main criteria:

1. Like a bridge, it needs to be somewhat ductile. Supported at each end, it needs to be able to flex several inches up and down without compromising structural integrity or wearing out too quickly.
2. Given the printing in sections, it obviously needs to be easy to fuse these sections together post-print.
3. I'm trying to go for light weight as well. I imagine most filaments are pretty close in density, but given the size of the finished product and the desire for low weight, I'd like to be able to go with a light filament, but this is more a 'nice to have' than a 'need to have'.

I'd be very grateful for any advice the forum has to offer here! Thanks all!