Cap Keeper - Smart Water Bottle

Don't lose your lid!  Only adds 2-3g in total weight for those counting.

Printed Parts

• Tether - TPU required
• Nubbin - PETG recommended

Non-printed Parts/Tools

• Super glue
• (Optional) Sandpaper

Assembly 

1. (Optional) Sand the contact areas of the Nubbin and the existing bottle cap to increase glue adhesion
2. Glue narrower side of Nubbin to top of existing bottle cap
3. (Optional) Clamp glued parts together
4. Wait for glue to dry
5. Fit larger end of tether over bottle (see photos)
6. Fit smaller end of tether over cap nubbin.  Keep the tether from twisting.