This tutorial was created for the school, sorry if you find any error ( I m French ).
But I hope this video can still help you !
The link:

Website : http://reprap.org/wiki/Diamond_Hotend
Repetier color mixing : http://reprap.org/wiki/Repetier_Color_Mixing
Repetier : https://www.repetier.com/
My extruder design : https://www.thingiverse.com/thing:2798515

🟠 Mon Imprimante 3D : https://www.wanhaofrance.com/?ref=Millomaker

Aliexpress link (tested and aproved) :
21 € in gift coupon in Aliexpress by my link when you create new account : https://a.aliexpress.com/_BSkqNP

Diamond Hotend : https://s.click.aliexpress.com/e/_d8KJGnp
https://s.click.aliexpress.com/e/_d7bo5JH

Very Good Stepper Motor (Nema 17) : https://s.click.aliexpress.com/e/_dZ0khpD
Good bowden extruder : https://s.click.aliexpress.com/e/_dYaOSLv
Stepper expander : https://s.click.aliexpress.com/e/_dWUXWKP
Teflon tube : https://s.click.aliexpress.com/e/_dYAMldp

✹ Me soutenir ❀ :
Tipeee : https://fr.tipeee.com/millomaker/
21 € en coupon offert sur Aliexpress si vous crĂ©er un compte en passant par mon lien : https://a.aliexpress.com/_BSkqNP

DOGE 🐕 : DBwN9iWjaonqA27h5Sx3nNAFxaSkHezcVM7
ETH : 0x2bf10947451c4EC8CD95E1A176Cf0e3D5ac29869