BED LEVEL VIDEO
There are two files required. First run the CHEP_ender_3_bed_level.gcode file on your Ender 3 or any similar size printer. Adjust each corner by running a piece of paper or Filament Friday sticker under the nozzle until you can barely move it.
Then run the CHEP_bed_level_test.gcode file and live adjust or "adjust on the fly" the bed level knobs to get as close to a level bed as possible.
The print will continue multiple layers but you can stop the print at any time and then you are ready to 3D print without worrying about bed level.
I also include the CHEP_bed_level_test.stl if you want to slice it yourself.
Download and unzip. There are three files included.