Website: thingiverse
Author: Mach0gr
Price: Free Download
File format: .Stl 3d printable
Description:
Print and keep one of these in your keychain. When at your favorite supermarket, use this to release a shopping cart/trolley. Pull it back and put again in your pocket. Happy shopping !This is my first 3d printer design back in 2014. The idea of course is not mine, I think there used to be dummy coins for shopping carts