So obviously i need a cooling fan for my prints. So far i haven't had many issues with my prints since ive been starting out with simple models. I will be getting in to more complicated prints in the future that will have many curves and overhangs with support. I'm using 1.75mm PLA. I know i can find many ducts on thingiverse or design my own but my question is does the fan need to be directed on the print or on the extrusion head? is it cooling the filament that has been placed on the most recent layer? Thanks!!