Ceiling rose for a ceiling lamp !

to keep all the wires on the ceiling out of sight....!

I prefer to print it upside down, otherwise dealing with support for the fixation parts on the sides seems to be more difficult (never tried it!) than the support for inside the thing.

Hint: there is room for improvement. right now the ceiling rose needs two nails/screws to be fixed on the ceiling. one could make it more convenient like IKEA ones. FreeCAD file is attached, do not hesitate to change it!