I was inspired to do this remix. The basis is the 5mm center post. I use 1.8mm walls and 0.25mm clearances which works great with my printer.
The print-file has 4 pieces. A decent bracelet can be had with about 20 links.
All overhangs are 45 degree or less so no supports are required.
Spacing is 10.2mm in case you want to link more during the print.
They can also be printed individually by deleting extra links in Meshmixer.
Let me know if you have a custom clearance request.
...thanks for the idea, Luke.
And as a designer, please note that I did not let the link do a full 90 degrees rotation. This is a design feature to allow the "tracks" to roll. It should be easy to re-purpose this design for vehicle track systems.