Plantar Fasciitis Graston Technique Scraper Tool

My partner suffers from Plantar Fasciitis and showed me the following video where a fellow sufferer uses a wrench as a makeshift tool for the Graston Technique.

https://www.youtube.com/watch?v=GQhtavGoL6A

As I don't have a wrench, and taking a large metal object through customs might get your collar felt by security, I knocked up a quick 3D printable tool to serve the same purpose.

Printed vertically it does not need supports, horizontally it will, but with the benefit of being a strong