https://3mftostl.io/ Convert 3MF to STL in your browser. Parts are merged, units are converted to millimetres, and the geometry stays on your device. en Sat, 14 Nov 2026 09:00:00 GMT https://3mftostl.io/ https://3mftostl.io/ Sat, 14 Nov 2026 09:00:00 GMT Convert 3MF to STL in your browser. Parts are merged, units are converted to millimetres, and the geometry stays on your device. https://3mftostl.io/formats/ https://3mftostl.io/formats/ Sat, 14 Nov 2026 09:00:00 GMT How the main 3D exchange formats differ and which one a print or CAD job needs. https://3mftostl.io/how-it-works/ https://3mftostl.io/how-it-works/ Sat, 14 Nov 2026 09:00:00 GMT How 3mftostl.io reads a 3MF file, what it rebuilds and what it drops. https://3mftostl.io/about/ https://3mftostl.io/about/ Sat, 14 Nov 2026 09:00:00 GMT Who runs 3mftostl.io, what the site tests and what it does not claim. https://3mftostl.io/privacy/ https://3mftostl.io/privacy/ Sat, 14 Nov 2026 09:00:00 GMT What 3mftostl.io does with files, logs and analytics. https://3mftostl.io/blog/what-stl-cannot-carry/ https://3mftostl.io/blog/what-stl-cannot-carry/ Sat, 14 Nov 2026 00:00:00 GMT A 3MF keeps parts, colour assignments and print settings. An STL keeps triangles. Here is what each of those losses costs after conversion. https://3mftostl.io/blog/stl-repair-after-3mf/ https://3mftostl.io/blog/stl-repair-after-3mf/ Sat, 14 Nov 2026 00:00:00 GMT An STL conversion copies triangles, so holes and flipped faces were in the source. Find the real boundary and the winding before running any repair. https://3mftostl.io/blog/stl-bigger-than-3mf/ https://3mftostl.io/blog/stl-bigger-than-3mf/ Sat, 14 Nov 2026 00:00:00 GMT A binary STL spends 50 bytes on every triangle, while a 3MF stores each vertex once and deflates the XML. Compare triangle counts, not file sizes. https://3mftostl.io/blog/slicer-wont-open-3mf/ https://3mftostl.io/blog/slicer-wont-open-3mf/ Sat, 14 Nov 2026 00:00:00 GMT A 3MF that opens as a ZIP is intact. If the slicer rejects it, the cause is the Production Extension or a truncated package. Convert and check the bounds. https://3mftostl.io/blog/prusaslicer-project-3mf/ https://3mftostl.io/blog/prusaslicer-project-3mf/ Sat, 14 Nov 2026 00:00:00 GMT A PrusaSlicer project 3MF bundles objects with print, filament and printer profiles. The CLI and GUI can export STL; neither carries the profile across. https://3mftostl.io/blog/makerspace-3mf-to-stl/ https://3mftostl.io/blog/makerspace-3mf-to-stl/ Sat, 14 Nov 2026 00:00:00 GMT A shared 3MF plate has to reach printers that only read STL. Naming, versioning and a bounding-box check decide whether the handoff works. https://3mftostl.io/blog/bambu-studio-3mf-to-stl/ https://3mftostl.io/blog/bambu-studio-3mf-to-stl/ Sat, 14 Nov 2026 00:00:00 GMT A Bambu Studio plate is a project 3MF built on the Production Extension. STL export keeps the triangles and drops the plate, filament and process settings. https://3mftostl.io/blog/ask-for-stl-or-convert/ https://3mftostl.io/blog/ask-for-stl-or-convert/ Sat, 14 Nov 2026 00:00:00 GMT Asking the designer for an STL adds a round trip and a second export. Converting the 3MF yourself keeps the geometry but drops parts, units and settings. https://3mftostl.io/blog/3mf-units-to-stl/ https://3mftostl.io/blog/3mf-units-to-stl/ Sat, 14 Nov 2026 00:00:00 GMT A 3MF declares micron, millimetre, centimetre, inch, foot or metre. The converter bakes that unit into millimetre coordinates; the STL then declares nothing. https://3mftostl.io/blog/3mf-parts-merged-into-one-stl/ https://3mftostl.io/blog/3mf-parts-merged-into-one-stl/ Sat, 14 Nov 2026 00:00:00 GMT A 3MF build item points at an object and a transform. The converter bakes both into one triangle list, so five objects arrive as five shells with no names.