Production-Ready CAD Designs for Engineering Teams
Discover, buy, and sell professional 3D CAD models on a global engineering marketplace.
Marathon-OS Design Hub
Everything you need to design faster, smarter, and with more impact.
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Everything you need to design faster, smarter, and with more impact.
![[2146] Spear Gear 25T (Plastic Pinion Gear) For Robotics & Science Projects - Standard Mechanical Component](/_next/image?url=https%3A%2F%2Fd1d8a3050v4fu6.cloudfront.net%2F681513dffcc7c6ee36fcf800%2Fsprite_0_0.webp&w=640&q=75)
Why Marathon-OS?
For people who need CAD files they can actually trust and use.
No blind downloads
Preview CAD files online using Marathon previewer before you pay.
Quality-checked designs
Every CAD file is manually reviewed before listing.
Built for engineering use
Focused on real engineering, manufacturing, and production needs.
Marathon-OS free to use tools
Use powerful engineering tools without installing any software
CAD Viewer
Preview 3D CAD files online to inspect geometry and structure (powered by the Marathon-OS proprietary CAD viewer)
CAD Converter
Drag, drop, and convert directly in your browser (with no local CAD tools needed)
Become a creator on Marathon-OS
Publish your CAD designs, reach engineering teams, and monetize your work on a platform built for real engineering use.
Create your profile
Set up your creator profile with your expertise and portfolio.
Upload CAD files
Upload your CAD files in supported formats to the platform.
Add details
Add title, description, and tags so engineers can discover your designs.
Set pricing & publish
Choose to share for free or set a price, then publish your design.
Designed for Security
Capturing everything you see, say, and hear means trust and privacy is more important than anything else.
Encryption at rest
Encryption in transit
Single-sign on
Role-based access controls
Logging, auditing and monitoring features
Features to enhance privacy of personal data
Frequently Asked Questions
MarathonOS is a marketplace where CAD designers sell CAD designs to engineers, agencies, and organizations. Buyers can discover designs, purchase securely, and download instantly.
Go to your dashboard and click "Upload CAD File." Upload your file, add a title, description, previews, and pricing, then click "Publish" to list it on the marketplace.
Open the design page and click "Buy/Download." After checkout, your file will appear in your Purchases/Downloads section, where you can download it anytime based on the license.
All designs come with a Standard Usage License, allowing you to use, modify, remix, and commercially use the asset in your own products, client work, marketing, and team projects—royalty-free. Reselling or redistributing the original CAD file itself is not permitted.
Creators set their own prices when publishing. When a buyer purchases a design, creators earn the sale amount minus a 10% commission, with earnings visible in the dashboard.
Yes. Collaboration is supported through your dashboard. You can work with other creators on shared projects, and teams can manage access to designs based on the license or plan.
If a file is broken, incorrect, or you need support, contact us via the Contact Us page or email [email protected] with the listing link or order details, and we'll help resolve it.
The CAD marketplace for modern teams