USELESS : ONLY USEFULL IF YOU HAVE PROBLEMS WITH YOUR HEATER.
I had some problems to obtain more than 200° with my original extruder. Then i created this brace to protect the hotend fron fan air flux. It is now more easy to gain 215°.
This thing is useless as soon as you've changed your heater with a good one. After i reported my problem to emotion tech, they send me a new one (for free) and now i don't need this brace anymore.