Garmin 910XT 22mm Aerobar Extension Mount by slonold

Last crawled date: 3 years ago

Overview
Simple system with adjustable viewing angle to mount a Garmin 910XT via the standard wrist strap to 22mm diameter aerobar extensions. Accommodates inner bar spacing of 40 to 50mm as well as shifter cables running on the inner face of the aerobars.
Tools and Materials Required
3mm x 3 to 6mm long or #3-48 x 1/8 to 1/4" long set screws for angle adjustment X2
1.5mm(for m3) or 0.050"( for #3-48) hex key for set screws
2.4mm or 3/32" (for m3) or 5/16" (for #3-48) drill bit to size set screw holes
m3 x 0.5 or #3-48 tap
Miniature Cable Ties (100mm/4" x 2.4mm/3/32" x 1mm/0.04") X4
Half round file ~12mm/1/2" and sharp knife for clean-up.
Printing
Print 2 of Garmin_Mount_Pin - recommend individually for best diameter consistency
Print 1 of either Garmin_Mount_Centre_Front_Adjust (pictured) or Rear_Adjust
Material: PETG recommended
Shell Thickness: 1.5 to 2mm
Infill: 10-15% should be plenty
Support: Not required if layer height is small. i used variable layer height from 0.32mm on the bottom of the pins to 0.16mm for the section with the cable tie passage (Slic3r) with a 0.5mm nozzle.
Assembly:
Size the angle adjustment holes and tap threads - remember PETG likes it slow, cool and needs frequent chip clean out in order to avoid rewarding you with a gummy mess. Note that you will likely have to bury the tap in order to get threads through to the bore of the centre piece but bear in mind that a snapped off tap in the work piece is a sad sight indeed.
Clean up the bore of the centre piece and outside of the centre pins ensuring pins fit freely but not loosely in centre piece and that the cable tie passages are reasonably clear..
Install a cable tie in each pin (a little judicious curving of the cable tie will help).
Push both pins fully into the centre piece.
Locate between extensions - note that oblong hole in centre piece faces up.
Add second cable ties and tighten firmly.
Mount watch - note that strap does not have to be tight - spare your spring pins
Adjust angle and fix by gently snugging set screws.