Summary
Here in Canada most if not all big grocery store carts need a coin to unlock for each other. This isn't rocket science so anything close to the size of each coin works well. You get the coin back but some time you don't have one but this way you can make sure to have one all the time.
Production Info
Application scenario
Laser
Software
xTool Creative Space
Machine & processing module
xTool S1
20W
Material used
clips
metal ring
Transparent Acrylic
This project uses black cast acrylic that is 1/8" thick. This acrylic is from xTool.com. a way to make this go on a your keys are plastic ring clips and a metal ring both these items are from amazon.
Also compatible with other machines. Visit the Material EasySet Library for more.
License
(aka CC Zero) is a public dedication tool, which allows creators to give up their copyright and put their works into the worldwide public domain.