There are three files; they are all the same, aside from length, since the windowsill exposure length can vary.
The first one is 39.2mm from the wall to the end of the windowsill, then +10mm and +50mm.
For how to acquire the desired length, my recommendation is as follows: just cut within your slicer, and you are good to go:)
The author marked this model as their own original creation.