Anet A6/A3 printhead assembly

I want to make some changes to the hot end assembly of my printer. I make all my designs in FreeCAD. I have created the complete, original hot end assembly so I can check my designs before printing. The STL files are therefore rather intended as illustrative objects. Except the acrylic parts, which can be used for the printing of spare parts immediately.
The FreeCAD models are enclosed in two zipped files, on the one hand as complete models to which own adaptations can be made and on the other