Test Print Example - BED LEVELING TOOL - ENDER 3
This Ender 3 Bed Leveling tool uses a Pulse Induction Metal Detection Sensor and a LED Bar graph to show the relative distance from the Print Head to the hotbed. This is an independent add-on that does not require any code changes to printer firmware or wiring. It is easy to attach to check and tune bed levels.
The calibration button on the top of the unit is used to reset the baseline height and recenter the LED indicator to the center of the bar graph.
Build instructions can be found here https://www.instructables.com/id/LED-...