need help mulit color changing with ender 3 pro v4.2.2 with esp32 and repiter server and printer what i got sofar To achieve the workflow you described, where you send G-code from your printer to Repetier Server, then to your ESP32, and finally back to the printer after the ESP32 completes its task, you'll need to implement a custom communication protocol between your printer, Repetier Server, and ESP32. Here's a general outline of the steps: 1. Communication Between Printer and Repetier Server: Make sure your printer is connected to Repetier Server. This usually involves configuring the printer settings in Repetier Server and ensuring a reliable connection. 2. Establish Communication Between Repetier Server and ESP32: For communication between Repetier Server and your ESP32, you can use a protocol like HTTP or MQTT. Here's a simplified example using HTTP: ESP32 Code (Arduino): cpp Copy code #include <ESP8266WiFi.h> #include <ESP8266HTTPClient.h> const char* serverAddress = "http://repetier-server-ip:port"; // Replace with your Repetier Server IP and port const char* endpoint = "/esp32"; void sendCommandToServer(const char* command) { String url = serverAddress + endpoint + "?command=" + command; HTTPClient http; http.begin(url); int httpCode = http.GET(); if (httpCode > 0) { // Handle the server's response if needed } http.end(); } void setup() { // Set up WiFi connection // Your setup code here } void loop() { // Your loop code here // Example: Send a command to the server sendCommandToServer("move_servo"); delay(5000); // Wait for the servo to complete its movement // Send completion signal to Repetier Server sendCommandToServer("task_completed"); delay(5000); // Wait before sending the next command } 3. Repetier Server Script: Write a script or plugin for Repetier Server to handle the commands sent by the ESP32 and pause/unpause the print. This may involve using Repetier Server's API or webhook functionality. 4. G-code for Filament Change: In your slicer or G-code file, include a specific G-code command to trigger the custom process. For example: gcode Copy code ; Custom process start M118 // Notify Repetier Server to expect a custom command M600 // Pause the print ; Custom process end 5. Update Marlin Firmware: Make sure your Marlin firmware is configured to handle the M600 command and any other custom G-code commands you use. Important Notes: Adapt the code to match your specific requirements and hardware. Be cautious with delays in the ESP32 code, as it may affect the print quality if not handled properly. Ensure that your ESP32 has a reliable network connection to communicate with Repetier Server. This is a complex process, and testing thoroughly is crucial to ensure the reliability and safety of your 3D printing setup.