I had to mount terminals on the DIN rail, but didn't find the commercial or DIY solution. So, I used TinkerCAD to create something working :) Yes, it is not ideally modeled, but works good. If you use Prusa or Orca slicer you can use "fix the model" and "simplify model" features, but it is not necessary.
WAGO_3way_DIN_holder.stl | 26.5KB |