From Pinterest Image to Hot-Wire Foam Cutting Via Web Browser (No Software to Install!)

Have you ever found a great vector design, logo, or typography on Pinterest and wanted to cut it out of polystyrene/foam using a hot-wire CNC machine?

Usually, this requires downloading the image, vectorizing it in Inkscape, generating G-code with a CAM plugin, and using dedicated desktop software (like Universal Gcode Sender or Mach3) to send it to the machine.

In this project, I will show you how to skip all software installations! We copy an image directly from Pinterest, paste it into costycnc.it/cm8, automatically convert it into G-code with built-in foam bridge support, and stream the commands straight to the stepper motors via USB using the WebSerial API.

Hardware:

Hot-wire foam cutting machine (e.g., CostyCNC model or any Arduino/GRBL-based hot-wire cutter).

1. USB cable to connect the Arduino board to your PC/Laptop.
2. Styrofoam / EPS / XPS foam block.

Software / Web:

1. Chrome or Edge browser (supporting WebSerial API).
2. Web Application: costycnc.it/cm8
3. Black and white target image from Pinterest.

Find a black-and-white silhouette or typography on Pinterest (for example, a continuous "Love" word graphic).

Right-click the image and select Copy Image (or save it to your clipboard).

Open costycnc.it/cm8 in Google Chrome or Microsoft Edge.

Paste the image directly into the workspace.

The web app automatically converts the raster design into vector paths (Image-to-Gcode).

Key feature for hot-wire: The app automatically generates entry/exit bridges so the hot wire cuts inside holes and continuous loops without destroying outer perimeter walls.

Connect your CNC machine to your computer using a standard USB cable.

Click on the Connect / Serial button on costycnc.it/cm8.

Select your Arduino COM port in the browser popup window.

Press Start / Send G-Code. The web page now acts as a native G-code Sender, moving the stepper motors and hot wire in real-time.

Once the hot wire completes its path, you get a clean, physical polystyrene cutout matching your original Pinterest image!

1. Video Demo: Watch the entire process in action on this YouTube Short.

costycnc.it/cm8 is an open, universal web application for any GRBL-based CNC machine:

1. Direct Raster Image Input (No SVG/Vector needed): Unlike traditional CAM tools that require vector files (SVG or DXF), costycnc.it/cm8 accepts standard raster images (JPG, PNG, BMP, or direct copy-paste from clipboard). An internal Potrace-based algorithm automatically traces the pixels into continuous vector paths and adds entry/exit foam bridges for hot-wire cutting.
2. Universal GRBL & MKS-DLC32 Wi-Fi: Stream G-code directly over USB (WebSerial API) to any Arduino/GRBL controller, or connect via Wi-Fi to MKS-DLC32 board (where the web app is embedded directly into the firmware). Try the live demo at costycnc.it/mks-dlc32.
3. Standalone G-Code Generator: Generate G-code directly from raster images and export it to run on external software like LaserGRBL, LightBurn, or other G-code senders.
4. Standalone G-Code Sender: Import external .gcode files and stream them straight to your CNC stepper motors without installing desktop software.
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Most traditional CAM software and AI models expect you to input vector files (.svg, .dxf). This creates confusion for beginners who think vectorization is a mandatory manual step.

costycnc.it/cm8 simplifies this entire process internally:

1. Zero Vector Preparation Required: You do not need Inkscape, Illustrator, or SVG files. Simply paste a standard raster image (.jpg, .png, .bmp) directly from your clipboard or Pinterest.
2. Automated Internal Tracing (Potrace Engine): The web application integrates a custom client-side Potrace algorithm that instantly detects black-and-white pixels and converts them into clean, continuous vector paths in real time inside your browser.
3. Automatic Hot-Wire Foam Bridges: Beyond simple vectorization, the built-in logic automatically calculates entry and exit lead-in paths (bridges), keeping inner shapes connected without manual editing.
4. Universal Compatibility (GRBL, MKS-DLC32 & External Software):
5. GRBL via USB/Wi-Fi: Stream G-code directly over USB (via WebSerial API) or Wi-Fi to any GRBL controller, including the MKS-DLC32 board (where the web GUI is embedded directly into the firmware—demo at costycnc.it/mks-dlc32).
6. Standalone Generator: Export generated G-code to run on LaserGRBL, LightBurn, or other senders.
7. Standalone Sender: Import external .gcode files and stream them directly to your motors without installing desktop software.

By shifting the vectorization, G-code generation, and serial transmission entirely inside the web browser, costycnc.it/cm8 removes the steep learning curve traditionally associated with CNC machining. You do not need expensive CAD/CAM software, vector editing skills, or dedicated desktop drivers. Whether you are using a standard Arduino-based GRBL cutter, an MKS-DLC32 Wi-Fi controller, or simply generating files for LightBurn or LaserGRBL, this browser-based workflow takes you from a raw web image to a physical cut in just a few clicks.