Ender 3 Dimmer Switch Mod

LCD covers are cool, but they're not light-tight. Instead, modify the PCB to take full control of the backlight! This mod works in full daylight just as well as in total darkness, and requires no mounting hardware. Tested on Ender 3 Pro.

### You will need:
* 1x potentiometer with switch. I used and recommend the [P170SP1-FC15AR10K](https://www.digikey.com/en/products/detail/tt-electronics-bi/P170SP1-FC15AR10K/5957483)
- You can use a potentiometer without a built-in switch, but you won't be able to turn the backlight fully off if you do. It will just get very dim. If the potentiometer is a lower resistance value (e.g. 1k instead of 10k), the backlight won't get as dim before it turns off, but it will still dim somewhat.
* 1x 100+ Ω resistor
- The resistor determines the max brightness—more resistance -> dimmer max brightness level. So, feel free to use a higher-value resistor if you want to tone down the screen permanently, but be careful using anything less, since you c