3MF to STL Converter

Got a 3MF from MakerWorld, Printables or a slicer project — but need a plain STL? Drop it above and get the mesh out, cleaned and ready.

Bambu/Prusa 3MF supportedInstantFree ≤25 MBNo sign-up

Why 3MF files need converting

3MF is the modern packaging format slicers love — it bundles meshes with print settings, plates and metadata. But plenty of tools still only accept STL: older CAD, mesh editors, some printers and marketplaces. StlWiz unpacks the 3MF, extracts the geometry, merges duplicate vertices and hands you a clean STL. Multi-object 3MFs are combined into a single mesh.

Frequently asked questions

How do I convert a Bambu Studio 3MF to STL?
Export or locate the .3mf file, drop it above, download the STL. Print settings and plate layout live only in the 3MF — the STL carries pure geometry, which is exactly what most tools want.
Does it work with MakerWorld / Printables downloads?
Yes — 3MF files from model libraries convert the same way. If a 3MF contains multiple objects they're merged; convert objects separately if you need them apart.
Is this converter free?
Yes — up to 10 conversions a day and files up to 25 MB, no account needed. Larger files (up to 60 MB) and high-detail STEP output use credits ($9 for 20). Everything runs server-side on real geometry kernels, and failed jobs auto-refund.
What happens to my files?
Files are uploaded only to run your conversion and stored briefly so you can download the result. We don't share them, mine them or train on them. See our privacy policy.