Downlight diffuser for chmt36/48

Light diffuser that fits the original charmhigh down camera tube.

This diffuser is printed with one layer white PETG and it fits with press fit into the tube.

Since the part is rather challenging to print, I have also addded the FreeCAD file - tuning migh very well be needed to suit different filament, different LED rings and camera sensors as well as different printers.

If, for nothing else, this could be a starting point. :-)