The upper cooling fans on Materium can be flipped. By default it blows inward.
If you flip it outward, the cooling fins will have higher temperature when working.
This is bad for normal printing because the pellets will enter compression already softened, and risk backflow. but good for high-flow (big nozzle 1-1.5mm or filament making mode) or high-speed (above 100mm/s) printing as it preheats the pellets more, and lowers the torque required.
Never remove the fans as the feed zone will have same temeprature with nozzle and it will make a pool of molten pellets.
DIAGNOSE – What’s Wrong
DO – Procedures
UNDERSTAND – How It Works
DECIDE – Is This Right For You?
MATERIUM – Extrusion System
Assembly & Installation