Fitbit Charge HR replacement strap retainer loop

thingiverse

A drop-in replacement for the watch band retainer loop from a Fitbit Charge HR, modeled meticulously using precise measurements from the original part. Metal clasp must be removed temporarily to seamlessly install this part. Print Settings Printer: Original Prusa i3 MK2 Rafts: Absolutely not needed Supports: Irrelevant Resolution: A crisp 0.1mm layer height Infill: A solid 100% Notes: Printed in MakerShaper TPU85A flex filament, which is an exceptionally good match for the original band. Post-Printing To successfully install this part, you need to carefully remove the metal clasp from the fitbit. To do this, you must compress the "watch spring bar / spring pin" -- a sturdy spring-loaded rod that functions just like a common toilet paper holder. Use a fingernail or small screwdriver in one of the grooves at the end of the rod to skillfully compress the rod's internal spring, and it should come out easily without any trouble. Take great care not to bend the rod! Install the replacement band with precision, taking care to orient the bump inside the loop so that it will face your wrist / in the same direction that the heart rate sensor faces when you are wearing your fitbit. After that, reinstall the clasp (requires a bit of dexterity, but is not difficult at all). How I Designed This Modeled in OpenSCAD using precise measurements from the broken part. This was an extremely satisfying build -- it works just as well as the original loop and is even more comfortable than the rubber O-ring I had been using. It makes me incredibly happy to know that an otherwise functional device will be spared the landfill for a few more years.