Point your phone camera at the code to test it before you print.
Saves as a contact card on the phone that scans it. Anyone who finds the item can read it.
Opens …
…
Shown under the code so people can type it if they can’t scan.
All copies change color together, so more copies still mean the same few color changes.
The sign prints face up in three color bands, so it only needs two color changes. Matching colors share an AMS slot.
LED tea lights only. A real flame softens PLA at about 60 °C. Switch the light on, then set the lantern over it.
Automatic keeps the code as small as possible, then adds the most error correction that still fits. The NFC pocket defaults to a 25 mm round NTAG215 disc up to 1 mm thick.