Generating STL file from KiCad

Making a projectbox with all the holes in the right place is quite a challenge.
Luckily for the makers that use KiCad as a PCB making tool there is a rescue!
Tools needed
If not already done you first have to install the latest version of FreeCAD.
Then you have to install the KiCadStepUp tool with the Addon Manager.
Creating a STEP file with KiCad
Start the PCB Editor
From the File menu select Export -> STEP
In the popUp [Browse] to the map where you want to save the STEP file and click on [Export].
Start FreeCAD
Click on the select box ..
.. and select the KiCadStepUp tool
Go to File->Open and select the STEP file from the KiCad Export
.. and click on [Open]
After a while you see the result of this import
Now all you have to do is Export this file
Select "STL Mesh" as type ..
.. and click on [Save]
The result is a nice STL file
Use this STL file with the YAPPgenerator
Add the following code to the beginning of your .scad file:
myPcb = "./STL/DSMRloggerESP32_PCB.stl";
​
if (true)
{
  translate([42,43,4.6]) 
  {
    rotate([0,0,90]) color("darkgray") import(myPcb);
  }
}
myPcb has to point to the generated .stl file
With translate() and rotate() you can place the .stl file to the exact location of your projectbox. This is a bit fiddling in the beginning but once set it does not change anymore.