This was designed in OpenScad.

One of my graduate student friends needed a specific mounting bracket for a LED to be flushed on the face of a surface to get better lighting.  So the idea was to have a hollow cylinder for the cords to get to the LED, and have the LED sit on the top of the cylinder.  The idea was abbandoned later on, but I still had this design so I put it here.  I updated it a bit to remove excess plastic if cost of plastic is a concern.  With the base settings, it costs about 30 cents to print.  Compared to the base setting with the option to remove plastic it costs about 20 cents.