Duplicating House Keys

thingiverse

Creating useful items on a RepRap 3D printer led me to a project of generating physical house keys by inputting key codes into an OpenSCAD parametric model. To avoid issues with my landlord, I purchased used locks and latches from eBay that include Kwikset KW1 and Schlage SC1 locks, the most common in the US. Designing the key model was easy as I measured a key with a ruler and calipers to create an approximate model. By parametrically differencing out pin depth specifications, new keys can be generated by simply editing the last line of the file. For those without key codes, measuring bit heights against a website's Root Depth column is possible. Alternatively, SNEAKEY could be used to generate key codes. To create the key, OpenSCAD is required to edit the .scad file and generate an STL for printing. The project showcases the printer's accuracy with small objects like this key, which worked on a disconnected lock cylinder and even turned a deadbolt. However, additional adjustments may be needed based on individual printers' settings.