As you may notice there should be two free fan plugs on Raise3D N2 printers which can be used for the additional two fans. May require some gapping for the limit switch but I will update where necessary. Print: 1no. Quad Fan Air Duct 4no. Fan Cover Additionally Requires: 2no. 35mm Axial Fans 6no. M3 x 10mm Socket Head Screws (Duct to Extruder Housing) 2no. M3 x 16mm Socket Head Screws (Through Fan & Cover @ Corners) 6no. M3 x 20mm Socket Head Screws (Through Fan & Cover Everywhere Else) Post-Printing: M3 tap on each angled face for fan through-bolts (2x per fan) Some light sanding may be required It is also a good idea to bring the stock fan wiring to outside of the housing so as not to overstretch the wiring in standard position - Cable manage as necessary. *This has been migrated from my Thingiverse (RIP): https://www.thingiverse.com/thing:3440161