Testing my printers for fire hazards - results all over the place...

Are my 3D printers safe? Will they realize their hotend is melting off? What can they do about it? I've got answers for all those burning questions in this very video!
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All machines shown in the video:
Original Prusa i3 MK3 by Josef Prusa https://shop.prusa3d.com/en/3d-printers/180-original-prusa-i3-mk3-kit.html#a_aid=toms3DP&a_bid=11110002
Ultimaker 3 http://geni.us/Ultimaker3
CR-10 https://toms3d.org/cr10yellow
E-10 https://toms3d.org/AnetE10
Mini Fabrikator v2 (v1 is discontinued) https://hobbyking.com/en_us/mini-fabrikator-v2-3d-printer-us-plug.html?affiliate_code=DQZNAHYXQDHEPBV
BCN3D Sigma R17 http://geni.us/OneSigma

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Amazon [???????? ???????? ???????? ???????? ???????? ???????? ????????] http://geni.us/bKkJuy
eBay [???????? ???????? ???????? ???????? ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????] http://geni.us/eSOtG
Matterhackers [????????] https://www.matterhackers.com/?rcode=TSAN86
iGo3D [????????] https://goo.gl/ROxm6Z
Aliexpress [????????] http://s.click.aliexpress.com/e/iMB6emu

???? All my video gear https://toms3d.org/my-gear