I made this to replace a small plastic part in the distributer of my Pop's MGB. It is the white part pictured next to the damaged original. It functions as a rotating shutter between a photo-gate that sends a signal to ignite the spark plugs. I modeled this part based after the "Crane xr700 Shutter" which fits the "Lucas 24D Distributer"We've tested this part in the car, and it worked perfectly!As you can see, I sliced the stl into two pieces and laid them flat to avoid overhangs when printing. This also allowed us to sand the top piece down a little (this part requires more precision that my printer's resolution allows). After that, the two pieces were glued together and then painted opaque black to ensure that no unwanted light gets through. Even if you have black filament you may want to add a coat of paint as parts of this Thing are quite thin. I've also included my measurements (in mm) of the original part to help with the sanding.