x2 Fans, you can choose 30, 40mm or 50mm model fan. I personally recommend the ones I used 40x40x20mm from EMPAPST 414H 65mA
3D printed dual fan-shroud (make sure to 3D print it before you start disassembling).
soldering
kapton tape, ceramic paper, or if you wan’t to be fancy get Nomex paper.
Recommended filament: Carbon - Formfutura warning: Carbon filament is considered abrasive. It may wear down your nozzle.
x8 M3 25mm Screws
x4 M3 10mm Screws for Ultimaker Original + or x4 m3 steel nuts for Ultimaker Original.
A drill with a 3mm bit to clean some holes of the printed fan-shroud
A m3 cap to mark the holes on the fan cap and 'bottom' printed parts.