Yeah, this is probably the same as the face shield or the ear savers. You are not a maker until you designed your own. 
I wanted a small ans sleek design for my key chain. Printed in TPU I even forgot I had it on me, when I was shopping even so I printed and mounted it a week ago. So it does not bulk my key chain and works just fine, when you need it. That is all I wanted.
Since I have no idea how this works in your country: In Germany you need to unlock the shopping card by using a coin or a token/chip, which you get back, when returning the card to the parking place. This thingy on your key chain allows to grab a cart without the need of using a coin or a chip. You simply push in the pirate, unlock the cart and since this is made from TPU you just pull out the pirate again. So it is a very handy tool on your key chain.
Shopping Cart Pirate on thingiverse.

I wanted a small ans sleek design for my key chain. Printed in TPU I even forgot I had it on me, when I was shopping even so I printed and mounted it a week ago. So it does not bulk my key chain and works just fine, when you need it. That is all I wanted.
Since I have no idea how this works in your country: In Germany you need to unlock the shopping card by using a coin or a token/chip, which you get back, when returning the card to the parking place. This thingy on your key chain allows to grab a cart without the need of using a coin or a chip. You simply push in the pirate, unlock the cart and since this is made from TPU you just pull out the pirate again. So it is a very handy tool on your key chain.

Shopping Cart Pirate on thingiverse.
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