Shimano casette removal tool
thingiverse
For a Shimano CS-HGxx-x cassette lockring, use a 15mm pedal wrench. To remove the cassette, you'll need to stop it from turning with a chain-whip or similar tool. Since the cassette stops naturally in the mounting direction, you won't have to worry about that side. This lockring has been printed and tested for fit. So far, it hasn't been used yet as part of a bigger project on bicycles using digital manufacturing techniques. You can find more information about this project on GitHub at https://github.com/jonnor/projects/tree/master/bicycle#tools
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