I liked Puffin's ST-Link V3Mini case here, but I had trouble getting it to actually work. Not only were the tolerances far too tight for my printer, but it just seemed to be too short for the PCB to actually fit inside. Perhaps STMicro changed the size of the PCB on new units?

I designed this to work exactly the same way as the original version -- the ST-Link is held inside the case via a press fit. However, I fixed up the dimensions for the ST-Links I had (purchased in early 2021) and loosened up the tolerances a bit.

For me, it still required some post-processing to remove stringers and a bit of extra material on the sides, but it was very manageable with a small hand file. However, if the tolerances are too far off for you, you may need to scale the part by +-5% or so before printing it.

After a bit of filing, my ST-Links are now protected from impact and shorts inside this case!

Note: Files section includes the STL for the case, as well as Fusion 360 files for the case and the ST-Link itself.