A simple 3/8" drive design that is very low height for the base to allow even deep sockets to fit in a shallow drawer. While you could redesign this to allow multiple sections to clip together, I just printed out these and applied gaffers/riggers tape on the bottom to connect them. This has worked very well and it's hard to spot there is a seam when they are in a tool box. Printed in different colors, red for SAE and blue for Metric. Standard PLA, nothing special here. Have not had any breakage issues and they just work.

Each rail can hold 9 socket pegs. If you tape two or more end to end, you can add one more at the joint between the two rails.

I'm working on an insert that will have 1/4" drive pegs but still use the same base rail to be compatible. Same for 1/2" drive.