I was out of closet wall space and wanted to hang some cords from the ceiling. Didn't find anything to my liking at the store, so I whipped this up. At 2 shells and 20% infill, it's adequately strong and a perfect fit for two #14AWG cords about 30' long each. 

doublehook.stl

double ceiling hook

Component1

5/8"-11 double ended bar for mounting a GNSS antenna when one has a tap but not a die

58-11 double ended bar v1.step

5/8"-11 threaded mount for GNSS antenna. Very similar to aliexpress item 4001252082447 but with more mounting holes. Print with lots of shells for strength, and adjust horizontal expansion until the thread fits just right. 

58-11-gnss-mount.step

Thread adapter to mount a 5/8-11 GPS/GNSS antenna on a 1/4-20 tripod.

58-11 thread adapter

58-11-thread-adapter

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doublehook.stl

double ceiling hook

58-11 double ended bar v1.step

58-11-gnss-mount.step

58-11 thread adapter