U2F token for $2 (Universal Second Factor)
thingiverse
The U2F token firmware update for the ST-Link V2 clone is available on GitHub (https://github.com/gl-sergei/u2f-token) thanks to Sergei's contribution. A 3D printed end cap is necessary to seal the modified case, and it features a hole for a micro-switch of type D2F with dimensions 12.6x5.7x6mm. This switch serves as an indicator of "user presence". I used a D2F-01 switch from a broken computer mouse. The second, larger end cap design has a separate button (black cap and orange button) that provides better ergonomics for use. No modifications were made to the electronics or micro-switch. The STL files for both versions are available as st-link-u2f-token_v2.stl and st-link-u2f-token_v2_button.stl, along with FreeCAD files. A photo shows the port used for uploading U2F firmware, requiring a second ST-Link clone. Another photo illustrates the connections between the PCB and switch, with a small resistor valued between 1k and 3.3k ohms in place. To complete this project, two ST-Link devices are needed: one for updating or converting to a U2F token and another for uploading U2F firmware to the first device (or multiple devices). Additionally, you will require: * A D2F switch with dimensions 12.6x5.7x6mm * A small resistor valued between 1k and 3.3k ohms * Isolation tape
With this file you will be able to print U2F token for $2 (Universal Second Factor) with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on U2F token for $2 (Universal Second Factor).