So this is a new version of a previous design I did, which is still up, and had gaps so you can place a magnet and a hindge to the bracelets. To me this was problematic in several ways, like magnets can fail sometimes or demagnetize, and the hindge has to be a very specific size so the bracelet opens properly. So this is a completely different version, to open it you just pull a tab, and to close it you press both sides and it clicks. And most importantly it has a built-in hindge, just print the whole bracelet and its ready to use.
the part where it latches: you may need to slightly sand the little rectangular cube that sticks out. So it clicks in a smoother way.
internal circunference is 150 mm.