Hey everyone! 👋 I built 3mftostl.online because I kept running into the same frustrating problem: I'd have a 3MF file ready to print, but my slicer or print service only accepted STL — and every online converter I found either required an account, uploaded my files to some unknown server, or was just painfully slow. Privacy matters a lot in professional 3D workflows, especially when working with proprietary designs. So I wanted to build something that did the conversion **entirely in the browser** — no uploads, no accounts, no waiting. The approach evolved from a simple single-file converter into something that handles **multi-part 3MF projects**, preserving mesh geometry accurately and packaging everything into a ZIP when needed. The goal was always zero friction: drag, drop, download. That's it. If you work with 3D printing regularly, I'd love to hear your feedback — especially around edge cases with complex 3MF files. Happy to keep improving it based on real use! 🚀

3mftostl

Convert 3MF to STL directly in your browser

Convert 3MF to STL directly in your browser