My Renault Kadjar keycard have a difficult shape and plastic key holder or keychain support are not available, i tried to design my own in Autodesk Fusion 360 and printed several prototype on my Makerbot 3D printer.
As soon as i was happy with the design i sent the model to Shapeways to have a professional printed prototype, few adjustment were required and few other prototype were made after the first one.
This key holder let you open the keycad for access the physical key without removing the key holder itself.
i am now happy with the final design and think is time to publish it.
few more details available at: http://www.kadjar-keyholder.com/