Smoke alarm holder for Anet A8

I made holder for smoke alarm. I have installed mosfet, but to be sure and for additional safety I also installed smoke alarm with on/off switch. For safe night printing.

Example of parts list:
https://www.amazon.de/Unitec-46776-Rauchmelder-fotoelektronisch-wei%C3%9F/dp/B003BIERBQ/ref=pd_sim_60_2?_encoding=UTF8&psc=1&refRID=Z7PYGYH1ZZ06WWEF3BD5

http://www.bestronusa.com/detail/index.cfm?nPID=6451