Emergency Coin Keychain – £1, €1 & Quarter Sizes

Keep emergency change on your keys — always.

Designed for the moment you need a coin and don't have one. Shopping trolleys, parking meters, lockers, laundromats, vending machines — this keychain capsule keeps a small supply of £1, €1, or US quarter coins on your keyring at all times, without loose change rattling around in a pocket or bag.

Three sizes are included so you can choose between a slim everyday carry or a larger emergency stash.

Coin Capacity by Size

How It Works

The capsule is two printed parts joined by a snap-fit, so you can open and close it easily:

• Keyring Top — captures a split keyring ring permanently inside the print during a mid-print pause. Print this once and reuse it with any base size.
• Coin Holder Base — holds your coins. Print whichever size suits you.

The 3MF includes four plates: the keyring top plus all three base sizes. Print only what you need.

Keyring Ring Requirement

A split keyring with a minimum 25 mm diameter is required. The print profile includes a pause at the correct layer — insert the ring when prompted, then resume. The remaining layers capture it permanently. Do not start the keyring top without a suitable ring to hand.

Print Settings (tested configuration)

• Printer: Bambu Lab X1 Carbon, 0.4 mm nozzle
• Profile: 0.20 mm Standard with variable layer heights (for smoother curves)
• Wall loops: 3
• Main filament: SUNLU PLA+
• Support interface: Bambu Lab Support for PLA/PETG
• Build plate: Cool Plate SuperTack