After creating and making my "18650 to doubel Mono Cell" adapter i killed the original Light Bulb from the Flashlight.
It was foreseeable. Original Lightbulb 2,4V the new adapter 4,2V - 3,8V = RIP Lightbulb :-(
Here is my fast solution for this problem :-)
I guess this is only my fast solution because of the trouble with this little helper there will be Updates.
You need a LED an a small Screw .
Nozzel 0,4mm and 0,2mm Layer Height (Standart System)
Printerbed with Kopton Tape.
Printerbed with 55 degree.
Brim with 5 lines