Conversion story
So before all that there was a Creality Ender3 V2, which was a first printer and during many years it morphed little by little to gain more speed, more flowrate, bed levelling, magnetic bed, Klipper.. and still was printing reliably enough to avoid being replaced by anothing more modern :)
But there was still a feature that it missed - multimaterial printing. And in 2025 - year when multimaterial became the norm with all multiplexing filament changers and even proper toolchangers coming, this became a matter of survival for the Ender3..
Check the story of conversion and designs if you want to do the same: