Handelbar holder for Garmin Viovoactive HR. *** Diamter: about 27mm *** **** Filament The filament should be suitable for "being in the sun". I used PETG. Should also work with ABS. I do not recomend PLA > it could melt in the sun :-) Soft pad I recomend to put a soft pad on the top. Fixation Tighten with a cable tie and cut it flush.