SummaryA replacement ring compatible with the Holy Trainer 2, with Magic-Locker compatibility. Will provide more sizes over time.Print SettingsPrinter Brand: RepRapPrinter: Prusa i3Rafts: YesSupports: YesResolution: .1mmInfill: 5-10%Notes: Resolution is up to you, after-print care is what matters.Post-PrintingTake some 220 grit sandpaper and sand all the rough edges, especially on the inside of the ring, else it'll probably be uncomfortable. After that, it's highly recommended to take some Silicone conforming spray in order to make it body-safe, otherwise it'll give bacteria a place to stay. Or give it a spray paint color of your choice and dip it in polyurethane and let cure.How I Designed ThisI took multiple scans with my Atlas3D laser scanner, and superimposed them on top of each other as a reference. Then in Blender, I took basic shapes, (square and torus), and used the sculpting tool to shape it into something close to what I wanted. Afterwards, I used the Boolean modifiers to get nice flat surfaces on the attachment part. Printed, see how well it fit, modified design, repeat.