Here’s a better idea: draw the outline of half a 2-euro coin, add a “lollipop stick”, cut that shape out of 2mm aluminum from the hardware store, and you’ll never need a shopping cart token ever again: stick the half-coin into the cart’s lock, unlock, twist sideways and retrieve your little tool.

If you’re a nice person, unlock 10, 15 or the whole stack of carts for the next shoppers who need a cart and don’t have a coin.

It will work if you print it out of PLA, but it won’t be as durable and you can break it inside the lock.