Hello, welcome to my install guide!
_{*Disclaimer, I am not responsible for you breaking your printer.*}

Who is this guide for?
This install guide is for people that have confidence in tinkering or modding their printer.   

The reason I purchased this kit was because of the ability to print up to 20 different filaments. It's an extremely modular and open source system that can be mounted to most printers. I also wanted the ability to print nylon filaments with the option of using dissolvable supports. This extruder also has the capability of 300C for most plastics.

When I first purchased the kit from CoPrint, I asked them about the KCM's compatibility with the Ender 3 V3 SE/KE. They assured me that the kit would be compatible with the printer. I purchased the kit and looked at the wiki for a guide to this printer, seeing no instructions besides a GitHub repository with stl files. People besides me encountered compatibility issues with installing the kit because of unclear mounting instructions from what I found.

Of the other issues to list:
-The X-axis endstop button is coupled with the factory "sprite" extruder of the Ender 3V3 SE/KE, bundled with the ribbon cable.
-The files supplied for mounting the chromahead are only for the Ender 3V3 KE.
-The x-axis stepper motor is bundled with the ribbon cable. 

I solved most of these issues over my Christmas break from school and made this guide to help people install this kit. This guide serves as a stable baseline for other people to replicate. I can confidentially send prints to my printer with no issues with my setup.   

Klipper is required on your ender3v3 SE/KE for installing the CoPrint KCM.
Here is a guide that someone else wrote on installing klipper:
https://artamis.me/projects/klipper_guide/

Please use Klipper on your printer (stock) so you can learn how it works and if it works before starting.

Caveats:
-You will need to butcher your 3d printer slightly for functionality. (Assembly->Mounting the belt)
-Bed space is limited to 209mm on the X-axis with the Chromahead install.
-210mm makes the motor skip.

CoPrint website: Link
CoPrint wiki: Link

Prices:
-Retails at USD 399.00, sales happen a lot.
-I got my kit for $270 with coupons and Christmas sales.
-Linear rail kit is $28
-X-axis endstop $7.80