Shopping Card Chip (size of a 1 Euro coin)

thingiverse

I designed this shopping cart release mechanism chip to obtain a shopping cart that demands a one Euro coin to be freed. The chip's functionality is influenced by the cart's internal mechanics, allowing you to immediately remove it after releasing the cart so you won't forget it when returning the cart. To ensure proper operation, I created various sizes of this chip. If the indentation in the middle is too large, the cart release mechanism will not be triggered, rendering the chip useless. Conversely, if the indentation is too small, the chip successfully releases the cart but becomes trapped inside, increasing the likelihood that you'll forget your customized chip when returning the cart. The ideal size allows for seamless removal and reinsertion of the chip. I have thoroughly tested this chip with a 18mm indentation, verifying its effectiveness in releasing the shopping cart.