send a webhook message everytime print starts klipper

Guri Bee

3 min read

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01-10-2024

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Introduction

Klipper is a popular firmware used in 3D printing that enhances the capabilities of typical 3D printers by utilizing a host computer for computation. One interesting feature of Klipper is its ability to interact with webhooks. This article will explore how to send a webhook message each time a print starts, providing an effective way to monitor your 3D printing jobs remotely.

What is a Webhook?

A webhook is a method for one application to send real-time data to another application whenever a certain event occurs. In the context of 3D printing, webhooks can be used to notify other services when a print job starts, completes, or encounters an error. This can be particularly useful for users who want to integrate their 3D printers with other tools, such as messaging platforms or home automation systems.

Setting Up Klipper for Webhooks

Step 1: Configure Klipper

To begin with, ensure your Klipper configuration file (printer.cfg) is set up correctly. You need to include the webhook command in your configuration. Here's how to do it:

[webhook]
url: https://your-webhook-url.com/endpoint

Replace https://your-webhook-url.com/endpoint with your actual webhook URL where you want to send the notification.

Step 2: Add the Hook to Trigger on Print Start

Next, you need to configure Klipper to send a webhook every time a print starts. You can achieve this by modifying your Klipper configuration to include an event hook. Add the following section to your printer.cfg file:

[event]
event: PRINT_STARTED
command: webhook.send()

Example Configuration

Here's how your printer.cfg might look like with the necessary changes:

[webhook]
url: https://your-webhook-url.com/endpoint

[event]
event: PRINT_STARTED
command: webhook.send()

Step 3: Restart Klipper

After making these changes, restart your Klipper firmware to apply the new configuration.

Practical Example

Let’s say you have a home automation setup with IFTTT (If This Then That), which allows you to receive a notification on your phone every time your printer starts a job. You can create an applet in IFTTT that listens to your webhook and sends you an SMS or a push notification whenever it receives a signal.

1. Create an IFTTT Applet:

   • Go to IFTTT and log in to your account.
   • Choose “Create” and then select “If Webhooks”.
   • Set the event name to match what Klipper sends (e.g., print_started).
   • Connect it to your preferred notification service (SMS, email, etc.).

2. Testing the Setup: Start a print job on your 3D printer. If everything is set up correctly, IFTTT should receive the webhook notification, and you will receive an alert immediately.

Additional Considerations

When working with webhooks, consider the following best practices:

• Security: Ensure that your webhook endpoint is secure and can validate requests. You may want to implement token-based authentication or IP whitelisting.
• Error Handling: Make sure that you handle errors gracefully. If your webhook fails, you could implement a retry mechanism or log errors for future troubleshooting.
• Webhook Delivery Verification: You can log the webhook responses at your receiving endpoint to ensure the messages are being sent and received as expected.

Conclusion

Sending a webhook message every time a print starts in Klipper can greatly enhance your 3D printing experience by providing real-time notifications and integrations with other services. By following the steps outlined above, you can easily set up this functionality and create a more connected printing environment.

References

• Klipper Documentation: Klipper GitHub Repository
• IFTTT: https://ifttt.com

Implement these steps, and take your 3D printing workflow to the next level with real-time monitoring and alerts! If you have any questions or need further clarification, feel free to reach out to the Klipper community or ask a question in the relevant forums. Happy printing!