Ender 5 Runout Sensor Bracket

thingiverse

This design uses a bracket for mounting a "Lerdge" runout sensor, available from various Chinese sources like Banggood at https://www.banggood.com/Lerdge-1_75mm-Filament-Material-Run-Out-Detection-Module-Sensor-For-3D-Printer-Parts-p-1323359.html It secures to the X-profile with one M4x10 cylinder head screw and a T-nut. If you lack spare M4 T-nuts, you can use an M4 standard nut or opt for a printable T-nut at https://www.thingiverse.com/thing:3050607 - though it's M3 but should work. To complete the setup, you'll need two M3x20 cylinder head screws to fasten the sensor to the bracket. The included wire is suitable, but since the standard board lacks a dedicated connector for a runout sensor, an adapter board like this one from Banggood at https://www.banggood.com/Pin-27-Board-For-BL-Touch-Filament-Sensor-Compatible-With-Creality-Ender-3-Ender-3-Pro-Ender-5-CR-10-Mini-CR-10-3D-Printer-p-1436565.html may be useful. Lastly, you need to enable the sensor in the firmware and flash a new version. Creality's source code is available at https://creality.com/download/source-code_c0001