When your arms are full carrying stuff, you can still have your keys close at hand and not worry about dropping them. All rounded edges. Fits good in pocket. Hangs on hook.
The .3mf file has 4 sizes of this model. The inner diameters are 20, 25, 30, and 35mm. If you just want to print one, I suggest the 25mm. The 35mm size is too big for most people, but might work if wearing gloves. When you slice, delete any of the sizes you don’t want to print.
Slicer settings: 100% infill, 4 perimeters, brim. No supports.
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The author marked this model as their own original creation.