I found my previous third hand design (https://www.thingiverse.com/thing:2442217) to be excellent for soldering, but very annoying for storage. As I regularly store my electronics gear I decided to rework it to include a complete storage case.
In addition to the new storage case, it is now designed to better match the cheap Chinese made clothes pegs commonly found in Australia.
Also, much to my surprise, the screw threads printed perfectly, even with the printer running across them horizontally. :D
The lid is not designed to slide on. Instead it drops on top about 10mm forward of the base, and then slides back to lock into the closed position.
Update: 14/11/17 Added a meshed lid to try and resolve a problem with S3D.
Baseplate is printer with the base down.
Clamps on their sides
Lid printed upside down.