I 3D printed a Fitbit Air bicep mod to wear it under my sleeve

Published Nov 1, 2026, 5:00 PM EST Khumail has been writing about tech, gadgets and games for almost a decade. You can find his work on international print magazines like Stuff and What Hi-Fi, and even on websites like 91mobiles. He built his first gaming PC at the age of 16 by watching YouTube videos and troubleshooting thanks to Reddit. He's been writing smartphone reviews since 2016, along with PC, games, TVs, audio hardware and motorcycle reviews. He has a bachelor's degree in management with a major in marketing which helped him organise and host What Hi-Fi shows for audiophiles to experience luxury home entertainment systems. You'll never find me recommending a smartwatch because I get more than enough screen time to last me a lifetime. However, screenless trackers? I wear two of those. I switched from the Whoop band to the Google Fitbit Airrecently because it's economical, and I am not LeBron James. While saving money is part of the reason, I was also interested in the band because Fitbit Air bands can now be 3D printed, and Google just handed you the blueprints. People have been doing all sorts of magic with 3D printers, and I recently got a Bambu Lab P2S. The community has been printing more than just bands for the Google Fitbit Air, but I started with the obvious print. 3D printing to keep it classy Print your own strap or a case I wanted to 3D print a Google Fitbit Air strap, but I don't have any flexible TPU filament. However, I use my Fitbit Air for weight training, so even if I had one, the TPU strap isn't breathable and wouldn't be ideal for my needs. So it was easier to print a charging stand for the Fitbit Air charging puck (more on that later). While searching for community-made files, I came across a Fitbit Air-to-Whoop 4.0 adapter on the Bambu Studio app, which gave me an interesting idea. The standard Whoop strap is longer and more expandable compared to the Google Fitbit Air strap, which makes it somewhat easier to wear around a bicep. There are also dedicated bicep straps for the Whoop 4.0 and 5.0, which make them easier to wear on the bicep, but the official store doesn't offer any for the Google Fitbit Air. I also prefer to wear a traditional watch on my wrist rather than a band, so I 3D printed an adapter that lets me use the Whoop band as a housing for the Google Fitbit Air. I used PLA plastic to 3D print the adapter, and it hasn't come off or broken yet. Whoop, Whoop Is it better? There are some discrepancies in the metrics, and even before I moved my Fitbit Air from my wrist to my bicep, I compared the Google Fitbit Air to the Oura Ring 4. The Google Fitbit Air shows 10 minutes more sleep time than the Oura Ring 4. The Fitbit Air also tracks more steps than the Oura Ring 4. You should also know that wearing a fitness tracker on the bicep sacrifices step-tracking accuracy. Step tracking isn't all that accurate on these screenless trackers because we tested it, and if you walk 5,000 steps with Fitbit, Pixel Watch, and Whoop to find the most accurate tracker, the Google Pixel Watch is the clear winner. Folks on Reddit argue that Whoop tracks heart rate better on a bicep than on the wrist, but with the Fitbit Air on the bicep, I noticed only a small improvement in heart rate tracking. I wear the Fitbit Air on my bicep solely to hide the tracker under my sleeve, but improved heart rate tracking is always good. I prefer wearing an analog watch on my wrist and an Oura Ring 4 on my finger. The Google Fitbit Air can stay hidden under the sleeve. I also play soccer regularly, so any pushing and shoving during the game is better with the Fitbit Air on my bicep. You will need a proper bicep strap while strength training; otherwise, the standard Whoop strap might get undone. My Whoop band was catching dust after I stopped paying for the yearly subscription, so I experimented with the idea. However, you will find many third-party bicep bands for the Fitbit Air on Amazon. If step tracking is important to you, I would advise against it. It's a 3D world You can print more things for the Fitbit Air Google released the band's design guidelines and 2D CAD files publicly, so you can 3D print many things. The charging puck is tiny, so I printed a charging stand because it keeps disappearing in my drawer. Here's the link to the file. There are even analog watch strap adapters that let you wear a regular watch with the Google Fitbit Air. The adapter puts the Fitbit Air tracker between the watch strap and your wrist. It's a bit uncomfortable in my opinion, but some people are printing it, and you can too. People have even printed a boxer shorts holder, so the sky is the limit. You might soon see a chest strap version as well. These variations in the tracker placement come with caveats. You should expect inaccurate step tracking. Google also doesn't let you change your band placement besides the wrist in the app. So, the app still thinks you're wearing the band on your wrist. This might create inaccuracies as well, but hopefully Google realizes that serious fitness nerds want to experiment and maybe hope that they open those options for us in the app as well.