About this 3D model

The only thing you need are lego pins, lots of pins... Main project page resides here: https://www.prusaprinters.org/prints/63478-ultimate-lego-beam-and-frame-generator. This project is outdated, here is far newer and more versatile one: https://www.myminifactory.com/object/3d-print-beambridge9-ultimate-wooden-railway-bridge-system-224291