The importance of the first layer is paramount and will usually determine if your model is going to fail later in the build or not. Once you give enough attention to all of the details to get the right first layer, so many of your problems will disappear and your printing will become fun and much more predictable! In this video you will discover the 6 main factors needed to get great results:
1) Tram
2) Flat
3) Clean
4) Gap
5) Level
6) Live Level

Here are the leveling gcodes for CR-10, CR-10S4, CR-10S5, Ender 2 (3 Point Leveling) and Ender 3.
https://www.thingiverse.com/thing:476...
You can also adjust for your machine, just open in a text edit program and adjust the X and Y values so it stops over your knobs.

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