Extruder mounted “Prusa i3 complete production process” 3D DIY | August 12, 2015 | 0 | by leon Extruder installation is relatively cumbersome and direct heating and nozzle and fan, heating time to touch his mouth heat. Step 1 install ex-base Step 2 install the extrusion nozzles Step 3 install cooling fans, heating and fan wiring and extruder. Step 4 install ex-small