Dual Extruder Simple Metal Printrbot

I present you my Dual Extruder mod for my lovely PrintrBot Simple Metal

What you need:

.Extrudrboard (Around £25 Ebay)
.100k resistor (peanuts, this is needed to avoid the Mintemp error from the Extrudrboard)
.14pin Ribbon cable (more peanuts, I made one from a old hard disk)
.Stepper Motor (£10, I got two "Half Height NEMA 17" from Lulzbot)
.Hotend (£65 E3D v6, I first tried with a spare Ubis, but too much ozzing for my taste)
.Aluminium extruder (£35 original from PrintrBo