I was tired of having to wear two bands/straps so I decided to modify lloydskoyd's keychain to fit my garmin vivoactive HR.
I made it a whole without the keychain part and attached to a custom made retainer for the strap that is wide enough for the go-tcha to keep steady. This retainer has the pin that holds it in place so that it won't move at all.
It's been my first attempt using flexible filament (filaflex) so maybe the settings can be improved.
With time I'll see what it needs to be worked on.
Only added supports in meshmixer to the strap part, the one where the go-tcha fits doesn't need supports.
First attempt using filaflex
Removed the supports using needle-nose pliers with utmost care.