Keychain cameras have been enjoying a quiet revival, driven largely by a growing appetite for lo-fi photography and a general fatigue with the algorithmic complexity baked into smartphone cameras. Most of what’s available comes pre-assembled and pre-decided, right down to the app you’re expected to use and whose cloud account your photos end up in. That framing leaves very little room for the person actually taking the pictures.
Designer Matej Nahtigal built an answer to that problem, and it’s small enough to hang off your keyring. The Keymera is a fully functional camera that you 3D print and assemble yourself, built around just five printed parts and four electronic components. It takes real 3 MP photos, stores them locally, asks for nothing in return, and fits roughly in the same space as a car key fob.
Designer: Matej Nahtigal
The build is intentionally minimal. The electronics stack consists of a Seeed Studio XIAO ESP32S3 Sense board, a 3 MP OV3660 image sensor, a small LiPo cell, and a single tactile button, connected with four solder joints. Print the shell, wire the components, flash the firmware, and press-fit everything together. No screws, no glue. The whole process takes about an hour to print and another hour to assemble.
Using it is even simpler. A single button does everything. Press it once, and the camera wakes, captures a photo, saves it to a microSD card, blinks an LED to confirm, and goes back to sleep. On standby, it draws roughly 10 µA, which means it can sit on your keyring for weeks between charges without running dry. The logic behind all of it couldn’t be simpler.
Getting your photos off the camera doesn’t require a cable or an app. Hold the button, and the Keymera broadcasts its own Wi-Fi network. Connect any phone or laptop, and a gallery page opens directly in the browser. You can scroll through your shots, view them full-size, and download them from there. That gallery lives entirely on the device. No account required, no metadata harvested, no service to subscribe to.
What makes the Keymera a design object rather than just a circuit board in a box is the shell system. One electronics core fits into interchangeable outer shells, each inspired by a different camera era. The original three designs reference a rangefinder, an SLR, and an instant camera, with a twin-lens reflex (TLR) added as a fourth. Any color or filament finish is yours to choose.
That idea, that a camera should fit in your pocket, behave honestly, and let you own the experience from print to final photo, reflects Nahtigal’s deliberate pushback against a moment when phones are adding AI features to everything. There’s no computational processing, no hidden metadata collection, and no account to manage. You clip it to your bag, your belt loop, or your keyring, and it’s simply there when something happens.
The Keymera’s files are sold as licensed digital products, not released as open-source files, which keeps the design controlled and the project financially sustainable for a single maker. The photos it produces are lo-fi and unprocessed, captured on a fixed 3 MP sensor with no computational adjustments applied afterward. For something this small and this honest, that kind of clarity is very much the point.
