I didn't like the included holder, so I made this centerpiece for the DDD system. This is the set: https://www.parktool.com/en-us/product/sliding-t-handle-hex-wrench-set-thh-1
Note that I didn't include a slot for the largest 10mm size.
I also made a holder for the torx set here: https://www.printables.com/model/467102-park-tool-tht-1-sliding-t-handle-torx-compatible-w
The author remixed this model.
Added a new part to go along with the existing system