Lego Monorail Curve r20

8 stud smaller radius than the original curve pieces.

Also check out these other free printable files:

my monorail designs (motors, tracks, switches, stanchions, other stuff):

https://www.printables.com/@cbrick/collections/2018360

monorail cars:

https://www.4dbrix.com/products/monorail/3-02-trains/