I printed it in PETG with 70% infill and everything works fine.
if you dont have a Kubotan yet or if yours dosnt fit, you can download one here:
https://www.printables.com/model/251964-printable-kubotan
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EDIT: i had some problems with the holster, so i made this improved holster:
https://www.printables.com/model/355516-kubotan-holster
The author marked this model as their own original creation.