Print-in-place chain link fidget toy - available in 4 sizes.
You can roll, twist, curl the chain inside your hand(s) and make interesting shapes. For Medium and Large sizes, place it on two fingers and rotate the chain around, as if you were twiddling your thumbs.
No special settings are required for these models. However, the joints may need broken in, depending on the accuracy of your printer.
The filaments used in the pictures above:
Small - polymaker PolyTerra Marble PLA
Small - Fillamentum Wizard's Voodoo PLA
Medium - Inland Blue Tough PLA
Large - polymaker PolyTerra Army Red PLA
Large - Inland Yellow Tough PLA
XL - Fillamentum Lilac PLA