I've been working on designing a set of printable viaduct sections that can be used with Makrlin's Z scale track. Thus far, I have enough pieces for a circle of track with a feeder track. I hope to expand upon the set when I have more time.
The set currently consist of 4 parts. A 110mm track section, a 110mm feeder track section, a 195mm 30degree curved section, and a clip for clipping the sections toether.