I am the original creator of the Airtag Bike Mount - we launched these designs back in 2021 and were previously avaialble for sale on Etsy. I have since decided to open source these designs since I have closed down my shop. The design mounts an Apple Airtag securely behind your Water Bottle Cage on 99% of bicycles available on the market.
This variant was created for Trek & Bontrager riders, and allowed for clean integration into the Pro, Elite, and XXX Cage lineup. Trek's bottle cages have a raised mounting point and this mount integrates these into the design for a cleaner look.
PETG is recommended.