These are "spinner" targets that hang from a string for slingshot, pellet gun, BB gun, or airsoft gun practice.
See here for a similar target (no affiliation): https://simple-shot.com/products/spinner-targets
The FreeCAD file and target sizes 2-8cm are attached. Remix or resize the target as needed!
To resize, just change the value for the “Target Radius” in the FreeCAD spreadsheet.
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The author marked this model as their own original creation.