This works well for tightening the lockring on a Shimano™ Ultegra cassette. I made mine a bit slimmer. (edited)
Easy to print without supports. Connecting pieces warp due to without support but it does the job done. This does not snap as t the end hence I recommend using glue as well as instructed by the author. I used PETG.
This works well for tightening the lockring on a Shimano™ Ultegra cassette. I made mine a bit slimmer. (edited)