I have the newer version of Wera's Tool Check Plus, which doesn't have the belt loop, and I recently put my IKEA Skådis on my Raskog Cart so I can move my tools around with my other stuff. I wanted to have a way to mount my Tool Check Plus without having a huge holder for it that took a long time to print, and something simple that I can remove. In comes Franpoli's Parametric Ikea Skadis Accessories, which allowed me to download OpenSCAD and get started pretty easily on making accessories
Keep in mind I have no OpenSCAD experience, just a little bit of time and the ability to read. It is free and awesome.
…and one hour later on my X1 Carbon… voila!
Just print without supports, the box drops into the holder (all in one spot, tolerance fits may vary but it is .3mm in my case), you can read more about using Franpoli's wonderful tool here.