Ender 3 - Update README

creality-ender3/README.md

@@ -198,7 +198,7 @@ Proceed with the different calibrations in the above order:
 
 | Item  | 3D files  | Final result |
 |-------|-----------|--------------|
-| _Raspberry Pi 4 / Octoprint case_   | [Printable](https://www.printables.com/model/1008828-creality-ender-3-station-lcd-raspberry-pi-4)  | ![show off](/images/mods/octoprint-case.jpg) |
+| _Raspberry Pi 4 / Octoprint case_ ([tutorial to enable power switch/LED](https://web.archive.org/web/20250101204129/https://embeddedcomputing.com/technology/open-source/development-kits/raspberry-pi-power-up-and-shutdown-with-a-physical-button))   | [Printable](https://www.printables.com/model/1008828-creality-ender-3-station-lcd-raspberry-pi-4)  | ![show off](/images/mods/octoprint-case.jpg) |
 | _Ender 3 PSU Support Bracket_       | [Thingiverse](https://www.thingiverse.com/thing:3444134) | ![show off](/images/mods/psu-support-bracket.jpg)|
 | Aukey LM1 WebCam holder | N/A | ![show off](/images/mods/aukey-LM1-webcam-holder.jpg) |
 | PSU exhaust fan silencer | [Printable](https://www.printables.com/model/84197-60mm-exhaust-fan-silencer-flowmaster-psu-ender3nep/comments#preview.file.GpvjC) | ![show off](/images/mods/psu-exhaust-fan-silencer.jpg) |