The bulb holder on my E30 kept falling out, and upon realising the part was no longer available, I figured I'd recreate it. Part number is 63211376879.
I printed at .2mm layer height, 100% infill, and used tree supports only touching the bed. I also used PETG, which I would recommend over PLA just for peace of mind w/temperatures.
The author marked this model as their own original creation.