Robo 3D R1 High Flow 50MM Radial Fan Duct - Remix

Remix from two things:
http://www.thingiverse.com/thing:1890240

http://www.thingiverse.com/thing:1385737

Has four 6mm holes for 5mm LEDs

This is the fan I used: https://reprapchampion.com/collections/cooling-fans/products/12v-blower-cooling-fan-5020-50x50x20mm-reprap-3d-printer-extruder-for-pla