UPDATE 28/05/2020
Some people is talking of some security flaws and even if for me it has worked flawlessly in this 2+ year, i would like to point out that i'm not responsible for any kind of damage.
I'm sorry but i don't have the time anymore to improve this project. Feel free to make a new one and with better feature/security.. if you want i'll link it in this page.
UPDATE 16/04/2019
Hi everyone, fisrt of all i'd like to apologize for my absence due to university and work, finally i'm releasing solidworks files for this project so that you can modify them as you want. I can't wait to see how you will improve everything!
Solidworks files can be found inside a zip called "SolidworksFiles.zip"
Regarding relais upgrade i'm not sure if I have the time to do it, so if anyone wants to do it and share the design, that would be amazing!
AiO Ender 3 Octoprint Set Up
Features:
Easy to set up.
Printer on/off remote switch.
Light on/off remote switch.
Switches work with Octoprint telegram plugin.
NO CABLE MESS under the…

This mod is for adding a linear rail to the Creality Ender 3.  I have these versions installed on my machine and they are working well.
Is this a necessary mod?  Probably not.  The Ender 3 is a well built machine as it is.  It's something that you can do to gain a small improvement and probably less headaches down the road when the wheels an bearings start wearing.
I tried to keep it as simple as possible.  The required parts are few, the largest being the 300mm long linear rail itself.  At the time of this writing it was about $30.00 US on Amazon. Its cheaper by ordering it the weeks away method from China but with the quality on these things I spent the little extra so I could get it replaced if necessary.
Notes:
The hardest part of this project is to drill out the X gantry plate that holds the hot end on.  The thing that worries me is that Creality will change the plate a little.  I made the Drill Guide patterned after mine.  The first thing you should do is check to see if the drill guide aligns with your…