Upgraded my Ender 5 to a dual extruder/hotend setup, and after much trial and error, I have my first (nearly) perfect dual color benchy! Lots of hours invested in the printer upgrade
Add dual extrusion to your current 3D printer - dual switching extruder guide - YouTube
Dual Extruder on Creality Ender-3: How to Achieve This Amazing DIY Upgrade?