Collar/Bag Strap AirTag Holder

Summary

I designed an AirTag holder for a standard 1 inch/25mm (or smaller) collar. It's strong, filament efficient (about 4g), secures without any hardware, and allows for easily embossing your contact information and pet's name on the back.

The standard collar thickness is 1.6mm, but I also have 2mm, 2.5mm, 3mm versions if it's too snug a fit. I like mine a little snug so it doesn't slip around.

Print Settings

I printed with multiple colors (3mf files with my color scheme are in the Pre-colored Files directory among the downloads).  I also included a non MMU version that uses a negative volume to carve out the information; with a manual color swap, you can make the text stand out.

Perimeters: 3
Layer Height: 0.15mm
Top/Bottom Layers: 5
Fill Pattern: Cubic
Fill Density: 50%
Bottom Fill Pattern: Octogram Spiral

All parts should be printed as oriented, and do not require support material or a brim. 

A Note on Embossing Text

I've done the embossing natively in PrusaSlicer. For multi color (MMU) prints this is a two step process for which you'll need two identically formatted text objects. Create the first text object as a negative volume merged with the airtag-collar-bottom piece, and then a second text object as its own part (right click, add shape > text). These need to share the exact same x/y coordinates relative to each other, and the negative volume merged text will need to be grounded with the build plate (there is a “Drop to bed” option to the left of the z position, if it's not grounded already). If they are not properly aligned, you'll get a warning about “Conflicts in GCODE paths”.

If you're not doing a multi color print, or just want to do a manual filament swap, you only need the negative volume.

Material Choice

If you intend to regularly leave this in the sunlight or heat, I recommend printing all parts in ASA or PETG. Otherwise, PLA works great since there tend to be a lot more colors/finishes to choose from.