Cleat for soft nylon cord

thingiverse

I wanted to have an anchor for some soft nylon cord, http://www.nylonnet.com/merchandise/?item_id=1573&cat=473 #84 White braided mending twine, that would allow me to pull the corners of a sheet taut. This is the best of a series of experiments I tried, varying tooth shape and angle. The design is driven by Inventor's parameters, so can be adjusted to suit other cords. Instructions I used the academic version of Autodesk Inventor Pro (free to retired folk) under Parallels 10 beta on a MacBook Pro to design this. On my second try, with a clean start, I got it parametrically defined so it was easy to vary dimensions to try different sizes until it fit my cord well.