About this 3D model
These are reproductions of the common curved and straight train tracks that come with many wooden toy train sets (such as Brio, Orbrium, Thomas, etc). Created in Fusion 360 with a few tweakable parameters including track length for straight tracks, radius/angle for curved tracks, and fillet for elephant foot compensation on both. Any filament should be fine, but I printed in Overture orange PLA plus.