I redesigned blower bracket to keep blower perpendicular to the hotbed (crucial if you use round extruder fan duct).
Lack of support for circular fan duct (https://www.thingiverse.com/thing:2013199) drives me crazy. So I made extended version specific for this duct. Now circular duct is perfectly parrallel do the heatbed. No more sag. You can fix duct to the bracket by piece of powertape. CAUTION! For extended version heat resistant materials are strongly recommended i.e. ABS/HIPS/ASA
Fixing duct by tape sucks! New version (V2) has been uploaded. Now with two latches :]