Poor brackets! They are screaming…
soon on Thingiverse, these brackets are used to increase the stability of Prusa i3
I’m more worried about the evil looking hook…
It’s the fun duct of witbox extruder 
@Adrian_Ciubotariu Hi Adrian, just as you, I build my own i3 with the aluminium frame and, I’ll be very interested to find out where they go and what level of improvement do they bring. Details and figures will be much appreciated.
is a support for a bracing (made by two threaded rods) that stabilizes the “Z frame”
I just posted photos of these brackets working, here on the group
Oooo, saw them. The whole printer looks nice. Cool