The printer needs training to be used properly (or it needs a lot of up-keep).
To ensure only trained "responsible" use is also... time consuming... so
This is one (of many) way to provide access to a large, ever changing group, with out much overhead, to a 3D printer or other equipment (that has a safety stop input, or just power it off ).
The hardware is plug and play, no soldering required.
The firmware supports RFID 125Khz, or NFC
This is optimized for "quick", it could be optimized for $$$ if needed.
Secure enough, not uber secure... there are other solutions for that.