Z-axis adjustment knob for Ender 3, CR10 & more

ZKNOB (for Ender 3 you only need to print the knob - not the cover plate) 

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Originally designed in 2017 for the CR10, This knob lets you quickly manually control the hot end up and down (when steppers are disabled), which I have found to be VERY handy at times. For example whether you're loading filament, stopping a failing print or first layer, you can easily lift the hot end by hand to give yourself more working space and a better view on the piece. Easily fluently movable with just one finger.

VIDEOS
A simple quick and dirty demonstration by me of how the knob works:

 

And a more professional video by Chuck Hellebuyck on how to install the knob (and some other useful CR-10 (mini) mods) on Filament Friday:

https://www.youtube.com/watch?v=qDG\_C5y-psU&t=3m23s (3 minutes and 23 seconds in)