This is the 15032nd most frequent German word.
selbsterstellten
"Selbsterstellten" means "self-created" or "self-produced."
Here, 'selbsterstellten' describes the 'Rezepten' (recipes) emphasizing that they were created personally by the subject.
Ich habe ein Buch mit selbsterstellten Rezepten geschrieben.
I wrote a book with self-created recipes.
In this instance, 'selbsterstellten' refers to 'Modelle' (models), denoting items constructed independently by 'us' as the subject.
Unsere selbsterstellten Modelle haben den ersten Platz gewonnen.
Our self-created models won the first place.
Here, 'selbsterstellten' attributes the creation of the 'Berichte' (reports) to the individuals or group responsible, implying they were not externally sourced.