Open Brick

Live App

https://openbrick.cogan.dev

Open Brick is a browser-based tool for creating classic interlocking bricks and exporting them as STL files for 3D printing.

LLM-friendly docs:

• llms.txt (short rules)
• llms-full.txt (expanded context)
• .well-known/llms.txt (well-known mirror)

Brick type roadmap:

BRICK_TYPES_TODO.md

Shareable URLs (Query Params)

Share a specific brick configuration with:

https://openbrick.cogan.dev/?template=classic_brick&width=X&length=Y&height=Z&scale=SCALE

https://openbrick.cogan.dev/?template=classic_plate&width=X&length=Y&scale=SCALE

https://openbrick.cogan.dev/?template=classic_tile&width=X&length=Y&scale=SCALE

https://openbrick.cogan.dev/?template=mechanical_axle&l=L&scale=SCALE

Where:

• template: classic_brick, classic_plate, classic_tile, or mechanical_axle
• width: studs in X (classic_brick: 1-10, classic_plate/classic_tile: 1-16)
• length: studs in Y (classic_brick: 1-12, classic_plate/classic_tile: 1-16)
• height: plate units in Z (classic_brick: 1-9)
• l: axle length (mechanical_axle: 1-16)
• scale: global scale percent (90-110)

Example:

https://openbrick.cogan.dev/?template=classic_brick&width=4&length=2&height=3&scale=101

https://openbrick.cogan.dev/?template=classic_plate&width=2&length=4&scale=100

https://openbrick.cogan.dev/?template=classic_tile&width=2&length=4&scale=100

https://openbrick.cogan.dev/?template=mechanical_axle&l=6&scale=100

Notes:

• Opening that URL preloads the sliders with those values.
• As you move sliders in the UI, the query params update automatically so the URL is immediately shareable.
• Out-of-range values are clamped to the nearest valid value.
• 1x1 bricks are supported (width=1&length=1).

FAQ (Search-Friendly)

How do I make a 2x4 brick STL?

Open:

https://openbrick.cogan.dev/?template=classic_brick&width=2&length=4&height=3&scale=100

Then click Download STL.

What scale should I use for print tolerance?

Start with scale=100. If parts are too tight, try 99 or 98. If too loose, try 101.

Can I share an exact configuration?

Yes. Copy the URL after adjusting controls. The query string stores the full brick settings.

How do I make a mechanical axle STL?

Open:

https://openbrick.cogan.dev/?template=mechanical_axle&l=6&scale=100

Then click Download STL.

Does it support 1x1 pieces?

Yes. width=1&length=1 is valid for brick/plate/tile, and l=1 for mechanical axle.

What You Can Do

• Choose a template (brick, plate, tile, or mechanical axle).
• Adjust brick dimensions and global scale.
• Preview the model in 3D directly in the browser.
• Download the result as an STL file.

How It Works

• Everything runs client-side in your browser.
• No backend is required.
• Brick geometry is generated from .scad source files.

Run Locally

Serve this project with any static file server, for example:

python3 -m http.server 8080

Then open:

http://localhost:8080

Local share link example:

http://localhost:8080/?template=classic_brick&width=4&length=2&height=3&scale=101

Deploy

This project is static and can be hosted on platforms like:

• GitHub Pages
• Netlify
• Cloudflare Pages
• Vercel (static hosting)

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