this is a limit switch mod for elegoo phecda laser engraver. in order to use the limit switches you should connect the signal and gnd to the NO open contacts of the limit switch. you should be able to still use the 400x400mm working area with this mod

parts list:

1x Y axis limit switch adapter 3D print
1x X axis limit switch adapter 3D print

2x limit switch ([https://nl.aliexpress.com/item/32907313548.html?spm=a2g0o.order_list.order_list_main.5.662479d2XTOia9&gatewayAdapt=glo2nld](https://nl.aliexpress.com/item/32907313548.html?spm=a2g0o.order_list.order_list_main.5.662479d2XTOia9&gatewayAdapt=glo2nld))

4x M3 nut
4x countersunk M3x20
1x countersunk M3x16
1x countersunk M4x12
1x M4 nut
4x faston 6.3 (or solder with heat shrink)
2x jst xh 3 pin
1x 80cm 2 wire cable for X axis

1x 10cm 2 wire cable for Y axis

regarding lightburn configuration for limit switches and homing you can copy the settings in my screenshot in lightburn: edit>machine settings (must be connected to phecda)