Looks similair to the ws2812 led holders I designed - also in openscad. They are made in several sizes for the various diameter inserts. Not long ago I printed about 100 of them for a pinball machine.
For more details see http://3dwingmaster.blogspot.com.au/2015/06/lights.html. That blog is long due for some updates.
PM me if like the STL of it.
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