Please see the full explanation on tricks to getting a great first layer here if you haven’t seen already. https://youtu.be/8VgVwCeaovQ
Level your bed with a good leveling program that stops right above each adjustment knob. Always level with nozzle and bed heated to desired print temperature. Take your time in adjusting the heights, never move one knob too much at a time as this can bend your bed! It is preferred to use heavy stock paper to level, so you can feel the right resistance between nozzle and bed such that it pulls paper but allows me to push and pull it through without it bunching up. Keep allowing the program to cycle, as you adjust one knob it may send another corner slightly off. Go around the whole machine multiple times till you can make a full rotation around all knobs without having to touch a knob.
Once that you have leveled well, do a live level. This can be built into the model you are going to print by having the slicer create a one layer skirt 2-4 rings, as far away from the model but well on your build surface. As the machine is printing the skirt layers, observe and very slightly adjust any knobs in areas that are too high or too low. You will be able to get just the right settings with this method.
Here are leveling gcodes for CR-10, CR-10S4, CR-10S5, Ender 2 (3 Point Leveling) and Ender 3.
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.
https://www.thingiverse.com/thing:4761680
Link to tool holder: https://www.thingiverse.com/thing:2743012
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