Add dual extrusion with gradients - Mixing hot end guide

Dual extrusion can be very useful and is always visually impressive. It is possible to add it to an existing single extrusion printer. Previously, I fitted such a kit to a Tevo Tornado, converting it to a dual, switching ozzle machine, but that was very involved. The Bigtreetech mixing hot end kit as featured in this video is simple by comparison, although still needs a few extra parts and steps. The initial results here are good and I expect to improve after tuning retraction.

These products were purchased with my own money with the aim of making this guide. All opinions expressed are my own.

Purchase the BTT mixing hot end (as fitted in this video): https://s.click.aliexpress.com/e/_dYp...

Purchase the BTT 2 in, 1 out Ender 3 compatible hot end (shown but not fitted in this video): https://s.click.aliexpress.com/e/_dZF...

Models featured in this video:
Vase: https://www.thingiverse.com/thing:481268
Low poly fox: https://www.thingiverse.com/thing:937740
Dual colour tree frog: https://www.thingiverse.com/thing:329436
Race frog: https://www.thingiverse.com/thing:242...

CR-6 style ABL system for Ender 3 (now updated with the parts from this video): https://www.thingiverse.com/thing:442...
SKR V1.3/1.4 universal case: https://www.thingiverse.com/thing:386...
Filament spool holder for 2020 frame: https://www.thingiverse.com/thing:213...
My remixed, longer version: https://www.thingiverse.com/thing:455...

Previous video on switching dual extrusion hot ends:    • Add dual extrusion to your current 3D...  
Previous video on CR-6 style Ender 3 ABL system:    • CR-6 auto bed levelling for free on t...  
Previous video on dual extrusion printing:    • Dual extrusion guide: Cura, Simplify3...  

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