In the video I show and explain how to most simply change filament. Then I pop the fan off our extruder and show what's going on inside there so we can better understand what we are trying to achieve.
I hope this helps.
Awesome Sunlu Filaments available here: https://www.amazon.com/gp/product/B01NGT6BUS/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&tag=jm0f5-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B01NGT6BUS&linkId=d87c801a0bb7fd5d333ddc93eae4be14
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***PLEASE SEE NEW VIDEO ON EXTRUDER SETUP HERE***
I first heard of the 'Cold Pull' technique on the Official Anet A8 / A6 Facebook page. Check it out if you haven't already!