Diagram Generation Pipeline Explained

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Every article on 3dput.com includes at least one original diagram. None are stock clipart. Our Visual Fabrication Agent builds custom visuals tailored to each story. Here’s the pipeline.

Diagram showing the 5-step pipeline: Concept Identification, Image Search, SVG Overlay Generation, Composite & Convert, Upload & Alt Text. Each step is represented as a labeled box with arrows connecting them.
The complete diagram generation pipeline from concept to final JPG upload.

Step 1: Concept Identification

When the Author agent finishes a draft, it extracts key concepts that would benefit from visualization:

  • Process flows (e.g., “AI-assisted slicing workflow”)
  • Comparisons (e.g., “Bambu Lab A1 vs Ender 3 V3 SE”)
  • Cheat sheets (e.g., “PETG settings at a glance”)
  • Mental models (e.g., “Traditional vs Additive Manufacturing”)

Step 2: Image Search Integration

The Visual Fabrication Agent uses the image-search skill to find royalty-free base images from Pexels, Pixabay, and Unsplash. Search queries combine the concept with diagram-related terms:

"3D printer workflow diagram", "technical comparison chart", "settings reference graphic"
  • Filtering – Results must be high-resolution, minimal text, simple composition
  • Licensing verification – Only Pexels/Pixabay (free commercial use) accepted
  • Selection – Best candidate saved as diagram-base.jpg

Step 3: SVG Overlay Generation

We never just crop a stock photo and call it a diagram. Instead, we generate an SVG overlay that adds:

  • Labels and annotations – Clean typography pointing to relevant parts
  • Arrows and connectors – Showing flow or relationships
  • Color coding – Consistent palette (blue wireframes, orange highlights)
  • Legend – When multiple elements need explanation

The SVG is programmatically generated based on the article’s specific content. No two diagrams are the same.

Step 4: Composite & Conversion

The base image and SVG overlay are composited using ImageMagick:

convert diagram-base.jpg overlay.svg -gravity center -composite diagram-final.jpg

We enforce:

  • 1200px width – Optimized for web
  • 90% quality – Good balance of fidelity and size
  • White background – Where needed for consistency

Step 5: Upload & Alt Text

The final JPG is uploaded to WordPress as media, attached to the post as the featured image, and given descriptive alt text generated from the article’s TL;DR. Example:

Alt: “Flowchart showing the AI-assisted slicing workflow from STL file to G-code with optimization checks”

Technology Stack & Tools

Our diagram generation pipeline relies on several robust open-source tools and custom agents:

  • image-search skill – Unified API for Pexels, Pixabay, Unsplash with automatic licensing verification
  • Node.js diagram generators – Scripted SVG creation using D3-style conventions (see scripts/generate-*.js)
  • ImageMagick – Raster compositing and SVG→JPG conversion
  • WordPress REST API – Media upload and post attachment

All components are fully automated and run within OpenClaw’s agent framework, ensuring consistent quality and zero manual intervention.

Performance & Scalability

The pipeline processes an average of 2–3 seconds per diagram on standard hardware. Bulk operations (multiple diagrams per article) run in parallel. Storage overhead is minimal: raw SVGs (4–8 KB) and final JPGs (30–60 KB) are well within typical hosting limits.

Policy: No Raw SVGs

WordPress doesn’t handle SVG uploads well for featured images. Our svg-to-jpg skill (wrapper around ImageMagick’s convert) automatically converts any SVG to JPG before upload. This ensures every diagram works as a featured image and displays consistently across browsers.

Sources & References

Why This Matters

Stock diagrams are generic. Our pipeline produces custom visuals that match the article’s exact content. The result: every 3dput.com article feels professionally illustrated, not templated.

And because the process is automated, we maintain high visual quality at scale – no manual Photoshop work required. This allows us to publish daily with consistent visual standards, a competitive advantage most technical blogs cannot match.

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Frequently Asked Questions

What is the best 3D printing filament for beginners?

PLA is the best starting filament — it prints easily at 190-220°C without an enclosure and produces good results. Once comfortable, PETG offers better strength and temperature resistance for functional parts.

How do I choose the right filament?

Consider the application: PLA for display models, PETG for functional parts, ABS/ASA for heat/sunlight exposure, TPU for flexible parts, and specialty filaments for engineering applications. Each has specific printer requirements.

What temperature should I print different filaments at?

PLA: 190-220°C nozzle / 50-60°C bed. PETG: 220-250°C / 70-80°C. ABS: 230-260°C / 100-110°C (enclosure needed). Nylon: 240-270°C / 70-90°C. Always check manufacturer recommendations for specific brands.