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I know this is a old thread, but I recently 3D printed a plastic gear for a nerf gun out of some carbon fiber filament. It was very effective. I don't see why it wouldn't work in this application.
Are you referring to the whole assembly or just the lens? I've been considering replacing mine with the reproduction in the link below, but I haven't taken the old one off yet. There are a few good pictures of the assembly if you only have the lens.
Map light assembly