This is an articulating bracelet in the shape of a dragon swallowing its tail. It uses filament cutoffs as axles. While a press fit is acceptable, it is recommended that you glue loose joints together. In CAD, the hole size is set to 2.5mm to allow for shrinkage in printing. You know your machine best, if you wish to size it down slightly for a tighter press fit, feel free to do so. To wear, I remove one axle piece, place the bracelet on and replace the axle. When sized correctly, the tension from being on your wrist should provide adequate retention for any loose pieces.

To size the bracelet, take the circumference of your wrist in mm and divide by 10. This should get you close to the number of links needed. For instance, the print profile comes with 17 links as my wrist is around 172mm in circumference. I recommend using glow in the dark filament, it looks really cool on your wrist.