Just a simple flash drive holder, but it has a slot for a Yubikey. Seven full-size slots, and one half-size for the Yubikey (or similar small device).
Print Settings
Printer Brand: Creality
Printer: Ender 3
Rafts: No
Supports: No
Resolution: 0.2mm
Infill: 20%
Notes:
Be sure your extruder is properly calibrated. The slots have a tiny bit of wiggle room, but not much. Before I calibrated mine, it came out about 0.3mm too small and nothing fit.
Credits:
tannerfilip