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This mod is for adding a linear rail to the Creality Ender 3 CR-10S or S4 S5 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.