These 3d printed mounts are used to hold a light bulb in place within a wine bottle chandelier. This design was optimized to fit these (https://www.amazon.com/gp/product/B07QXXNJ4S/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1) light bulb sockets. The openSCAD file can easily be modified to fit any socket.
See more information at: https://www.appropedia.org/Wine_Bottle_Chandelier
Aubenc's "Poor man's openscad screw library" was used to help create this model: https://www.thingiverse.com/thing:8796