0.332 is a mod of the SCM SPR332 v2 card reader:

• compact 3D printed case

• less weight

• built-in OpenPGP smart card

• USB-C interface

Materials:

• SCM SPR332 v2 smart card reader (big and heavy)

• double sided tape, e.g. TESA 4965

• thin enameled wire, e.g. ⌀ 2mm = AWG 12

• Mini SIM socket, e.g. the 1981959 by TE Connectivity AMP Connectors (Tyco Electronics)

• SparkFun BOB-15100 USB-C breakout board

• 56k resistor

• smart card in mini SIM format

• 4 × screws: DIN 912, M2×6 mm

• 4 × nuts: DIN 934, M2

Tools:

• soldering equipment

• 3D printing equipment

• 400 grid paper for wet sanding

Steps:

1. Break open the SPR332 v2, and take out:

   • PCB

   • rubber keypad

   • (weight, which makes a nice keyring pendant)

2. Desolder and remove components from the PCB:

   • buzzer (big black cylinder)

   • SIM card socket

   • USB cable

3. Tape down the mini SIM holder in the correct position.

4. Solder six wires to the mini SIM holder:

   • Make sure that the wires don’t block the slot.

   • Don’t apply too much solder, or else the pins contacting the SIM may loose their elasticity.

5. Short the two pins for detecting if a card has been inserted.

6. 3D print the two shells comprising the enclosure.

7. Make everything fit: If needed, trim spacers in the 3D printed enclosure; Wet sand the top layer of the prints.

8. Position the SPR332 v2 PCB and the SparkFun USB-C breakout board into the enclosure’s top shell.

9. Connect the USB-C breakout board, pulling up CC1 with the resistor connected to VBUS.

10. Insert the mini SIM card.

11. Assemble the enclosure and tighten the screws.

Except where noted otherwise, files are licensed under the WTFPL.

Copyright © 2019 Felix E. Klee

This work is free. You can redistribute it and/or modify it under the terms of the Do What The Fuck You Want To Public License, Version 2, as published by Sam Hocevar. See the COPYING file for more details.