Monoprice Maker Select V2.1 Hot Bed Cable Bracket

This is by far the most important mod to add.
It will save your cables from breaking at the heated bed solder joints and frying your controller.

Bed Heater Cable Holder for Duplicator i3 & Maker Select

DualLED-i3-Mount

This goes along with the
"WANHAO i3 Fan duct" and "i3 v2.1 thorped fan adapter"
Remixed by JVKMakerSpace from someone elses mod.

WANHAO i3 Fan duct

i3 v2.1 thorped fan adapter

RepRapDiscount Full Graphic Smart Controller

Thumbwheel M3 with scale 0.01 mm with grip (Nut on bottom)