RP2350 Security Key (RS-Key) Case Remix

RP2350 Security Key Case Remix

This is my remix of an existing RP2350 security key case design.

I modified the case specifically for use with an RP2350 board running RS-Key, turning it into a compact DIY hardware security key / FIDO2 token.

RS-Key project:
https://github.com/TheMaxMur/RS-Key

Latest RS-Key releases:
https://github.com/TheMaxMur/RS-Key/releases/latest

What I changed

Compared to the original case:

• Simplified the case and removed extra details

• Made the USB connector protrude further from the case

The main reason for this remix was the USB connector. In the original design, the connector sits too deep inside the case. In my version, it protrudes further, making it easier to insert into USB ports.

Hardware

The board uses the RP2350 microcontroller and can run the open-source RS-Key firmware:

https://github.com/TheMaxMur/RS-Key

RS-Key turns the RP2350 board into a hardware security key and supports features such as:

• FIDO2 / WebAuthn

• U2F

• Passkeys

• SSH authentication

• OpenPGP / PIV, depending on firmware configuration

For a simple installation, download the latest prebuilt .uf2 release:

https://github.com/TheMaxMur/RS-Key/releases/latest

I use mine as a second / backup security key alongside an original YubiKey.

Printing

Recommended settings:

• PLA, PETG or similar

• 0.2 mm layer height

Important Note

This is not a genuine YubiKey. It is an enclosure for an RP2350-based security key running the open-source RS-Key firmware.

Security depends on the firmware, its configuration, secure boot settings, and how the device and credentials are managed.

Credits

This model is a remix of the original case design.

RS-Key firmware:
https://github.com/TheMaxMur/RS-Key

Thanks to the original designer for the base model.