This is a socket holder in chain form!

Files provided for 1/4", 3/8" and 1/2" drive sockets.

To make an open ended socket holder:
Print as many "links" as you have sockets - 1.
Print 1 "ring" and one "plug"

To make a closed loop simply print a link for every socket.

Print and add more links at any time. Links are designed to snap together. If you have some difficulty snapping them in, try angling so that one side of the bumped edge is inside the groove, then squeeze the other side in. Needle nosed pliers can also help to squeeze the outer prongs.