When the product designers at the New York City-based firm Tomorrow Lab discovered that the key fob for New York City’s Citi Bike share system could be cracked-open, they decided to transfer the key’s tiny RFID tag into a new container. Given the demands of the antenna position, the team could not stray too far from the original fob shape so, with design support from architectural journalist Laura Raskin, they came up with an elongated badge-like pendant shape that can be worn like a piece of jewelry. The on-demand 3D printing service, Shapeways.com, allowed Tomorrow Lab to create a gold-plated, stainless steel version of the product. Now if they could do something creative with all of those small plastic loyalty cards on my keychain.