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This is a replacement Hoover twist/lock latch ring. These are used on the hose, and wand extensions, of Portapower, Convertible, Spirit, Decade 80, Celebrity, etc. vacuum cleaners.
Generally, I avoid "making" anything that I can buy and these are available from many vacuum repair parts dealers for a few dollars plus twice again in shipping charges. However, the available replacements have a couple of issues: they tend to be poorly molded and the design has a thin spot where they tend to break; and they only come in black. My design thickens the area around the thin spot. And it's available in all colors that Shapeways offers to customize your latch rings to match your Portapower's accent color!
Since Shapeways reminds us that their 3D printed products are intended for decorative purposes, officially, this is a napkin ring.