Terms of Use

Last updated 2 October 2026

Using the site

You may browse the site, download design files and use the calculators for lawful purposes. Please do not scrape the site, bypass download limits, or interfere with its security.

Design files and licence

Each design page states its licence and source. The default licence for Heartline Works original designs is: free to use for personal projects and for physical products you make and sell; you may not resell, share or redistribute the design files themselves. Check the licence on each page before use.

Accuracy and fit

Files are checked as described in our file review process, but you are responsible for testing a design on scrap material and on your own machine before cutting or casting expensive material. Calculator and weight results are estimates.

No warranty

The site, files and tools are provided as they are, without warranty of accuracy or fitness for a particular purpose, to the extent the law allows. See also the disclaimer.

Rights concerns

If you believe a design infringes your rights, follow the steps on the copyright and takedown page.

Changes

We may update these terms. The date at the top shows the latest revision.