This small print holds one 3/8" drive socket (popping on or off). The printed holder can then attach to (sliding on) a piece of 1/2" PVC pipe (not included) of arbitrary length. My goals were:

a) print the smallest and simplest thing to hold a socket
b) make an easy attach / detach to some other cheap, abundant material (the PVC pipe)
c) allow users to write on the socket holder (the size of the socket)

If you want to keep 10 sockets together, cut a slightly larger piece of pipe, but if you have a set of 5 you often use, a shorter piece works. Print in different colors to know which is metric or English.

So, when I need to work on a lawnmower, I grab a 10" piece of pipe with 3/8", 7/16", 1/2", 9/16", and 5/8" sockets without. Yes, I can buy a similar stick with 10 or so spaces, but I've got an assortment of sockets and want to customize the number I put on one PVC pipe stick.

I have a 1/4" drive also, and will soon make the 1/2" drive.