This is a tool for helping to place vortex generators on the Sky Shadow S800 flying wing.
The vortex generators can be found here:
Begin at the outer winglet with the tool and place the first generator. The edge on the tool is the 20mm mark from the wing tip.
I made an image to make it more clear (hopefully). To make it more clear see Leephs comment :)
Jul/01/2018: Added single parts for smaller printers.
Print upside down to use less support material.