Voroni Lampshade
thingiverse
Designing a lampshade for 40mm lamp sockets requires some extra parts since it doesn't come with threads to secure it to the socket, so additional components may be needed. Printing the shade upside-down is a possible solution I've proposed. Update: The larger shade should fit bulbs up to 14cm in diameter, but I haven't printed this version myself.
Download Model from thingiverse
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