Trolley Key Keychain (AUD $2)
thingiverse
Insert the end of the key chain into the $2 slot, then unhook the trolley. The levered out resistance free due to curves on the handle end makes it easy to use. It is small enough to fit in with other items on your keys. The top surface provides a groove for placing your thumb in for better ergonomics. Designed specifically for an Australian $2 coin slot, this key chain requires no support. Simply place on the flat face and hit print.
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