An AirTag holder for anything: the pocket size, the lip, and a mount for a bike, a bag, a collar or a remote
An AirTag is 31.9 mm across and 8 mm thick: the pocket that holds it, the lip that keeps it in, and a holder that mounts to a bike, bag, collar or remote.An AirTag is a 32 mm disc with no hole in it, which is why holders are the second most printed thing after phone stands: it needs one for everything it is meant to track. The published holders cover keyrings. The holder you want is for the thing you own: under the bike saddle, inside the remote, in the lining of a bag, on the dog's collar, under the car's seat rail. Each is the same pocket with a different mount.
The pocket
The AirTag measures 31.9 mm across and 8.0 mm thick, with a domed white plastic face and a flat polished steel back (the battery door). The pocket that holds it:
- Diameter 32.4 mm, 0.25 mm of clearance per side: it drops in and does not rattle.
- Depth 8.3 mm if the pocket has a floor, so the dome sits just below the rim.
- A lip to keep it in: a rim 0.8 mm wide and 0.6 mm deep over the edge of the dome, with a 45° lead-in, so the tag snaps past it and stays. Or a snap lid, or a cover screwed on.
- A thumb hole in the floor, 10 mm, to push the tag out for the yearly battery change.
- Face the dome outward, steel back to the mount. The speaker is on the back; leave it uncovered or give it a few 1.5 mm holes if you want to hear it.
Printed PLA holds the snap fine. For a holder on something that vibrates (a bike, a scooter, a mower), PETG, and make the lip 1 mm.
Mounts, by the thing you lose
| Thing | Mount | What to measure |
|---|---|---|
| Keys, a zip, a bag strap | A 5 mm hole through a 3 mm lug | Nothing |
| Bike, under the saddle | Two slots for the saddle rails, 7 mm wide, at your rails' spacing | Rail diameter and the distance between the rails, typically 44 mm |
| Bike, in the bottle cage | A plate with two holes at 64 mm for the cage bolts, the pocket between | Nothing; the 64 mm is standard |
| Bag or jacket lining | A flat disc 2 mm thick with a sewn-on flange | Nothing |
| Dog or cat collar | Two slots for the collar's width, pocket faces out | Collar width and thickness |
| TV remote, controller | A sleeve for the remote with the pocket in its back | Remote length, width, thickness |
| Luggage | A card holder the pocket sits in, luggage-tag strap slot | Nothing |
| Under a seat, a desk, a shelf | A flat plate with two countersunk M4 holes or a tape flange | Nothing |
| Camera, tripod, light stand | A 1/4"-20 thread boss or a plate with a 6.5 mm hole for a tripod screw | Nothing |
For anything with the pocket against metal, add a 2 mm floor; the tag's radio does not mind plastic but a steel plate directly behind it shortens the range.
Other trackers
The same holder works for a Tile, a Samsung SmartTag or a Chipolo: measure yours (diameter and thickness for a round one; length, width and thickness for a square one) and swap the numbers. Round pockets get 0.25 mm clearance per side; square ones 0.3 mm per side with 2 mm radiused corners, and a lip on two opposite sides only, so it can be pried out.
If you have never measured for a print, how to measure an object for a 3D printed part takes ten minutes and saves a reprint.
Typing it into SpeakCAD
Say what the holder mounts to and give the measurement from the table. The AI builds the pocket to the AirTag's size with the snap lip, adds the mount, and states the sizes in its reply; the dimensions panel shows the pocket's 32.4 mm to check. If the first print's lip is too tight, say so: "the AirTag does not snap past the lip, open it 0.2 mm", a small change; on a plan, each part's first 3 small changes are included. For a holder you will print several of, Fit Check cuts a five-minute test slice of just the pocket and lip to try first, and the clearance your printer needs is kept for every later part.
By hand, free: a box or a cylinder, a 32.4 mm Hole 8.3 mm deep placed from the edges, a 10 mm Hole through the floor, a Fillet on the rim, and a 5 mm Hole in a lug Added at the side. The lip is the one feature a hand tool does not draw; a cover plate screwed on with two M2 screws does the same job by hand, with Screw head on each hole.
Printing
Pocket facing up, no supports, 0.2 mm layers, 3 walls. The lip's lead-in is an overhang under 45°, which prints clean. A keyring holder is 6 g of PLA and twenty minutes; a saddle mount about 15 g. Black PETG disappears under a saddle.
Shaping a part by hand (a hole, a cut, an added shape, text, rounded corners, a shell, every size typed in millimetres) is free, and so is downloading what you shaped. With the AI, a new part spends 4 credits on a plan with its first 3 small changes free, a design change 3, a small change 2, a quick edit 1; without a plan a new part spends 3. Start with Maker: 50 credits a month for $7.99, cancel anytime.
Prompts to start from
Open one in the builder, change the numbers to yours, and the model renders in your browser, usually within a minute or two. Keep adjusting in the chat before you print.An AirTag holder that clamps under a bike saddle: pocket 32.4 mm across and 8.3 mm deep with a snap lip, two 7 mm slots for saddle rails 44 mm apart, 2 mm floor, 10 mm thumb hole, PETG
An AirTag holder that bolts into a bike bottle cage mount: plate with two holes at 64 mm for M5 bolts, the pocket between them, snap lip, cage bolts on top
A collar tag for a dog collar 25 mm wide and 3 mm thick: AirTag pocket with a snap lip facing out, two slots for the collar behind it, rounded edges
Questions
31.9 mm in diameter and 8.0 mm thick, with a domed plastic face and a flat steel battery door on the back. A printed pocket of 32.4 mm by 8.3 mm deep holds it with 0.25 mm of clearance per side.
A lip 0.8 mm wide and 0.6 mm deep over the edge of the dome with a 45 degree lead-in snaps it in and holds it; add a 10 mm hole in the floor to push it out for the battery. Use PETG and a 1 mm lip on a bike or anything that vibrates.
No, a printed holder does not shorten the range noticeably. A steel plate directly behind the tag does, so keep a 2 mm plastic floor between the AirTag and any metal it mounts to.