Most complex 3D-printed assembly I've completed yet.  Probably my favorite too.

Most complex 3D-printed assembly I’ve completed yet. Probably my favorite too. And yes, the printed spring actually works.

@Nathan_Walkner This is a 1:3 scale model of a stand that “throws” a railroad rail. Which means, it moves the two railroad rails attached to it to change the direction of a train. Check out the picture below and hopefully that will give you a better idea of what it is.