First, download the Kwikset KW1 or the Schlage SC1 file depending on the key you want to print. These models were created by Nirav Patel. Open the file in OpenScad and change the last line of the code by entering in the key code of the lock. Your key may have the key code written on the side, but if not you can measure the key and compare the numbers here.

Compile the program and then export the file to an stl that you can print. If you don't have access to a 3D Printer, you can use 3D Hubs to find a local 3D Printer near you.

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Thank you!