Convert a Zipped 3D Model to 3MF for Modern Slicers
Upload a ZIP with a 3D model inside and get a 3MF for your slicer. The converter opens the archive, picks one model and turns it into a single uncolored mesh; textures and materials packed with it do not carry into the 3MF.
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Why Convert ZIP to 3MF?
Model sites and colleagues often send an archive rather than a model: an OBJ with its .mtl and textures, a glTF with its .bin, an STL plus a readme. A slicer wants one model file, and 3MF is the one Bambu Studio, PrusaSlicer and OrcaSlicer handle natively, so the archive has to be unpacked and converted before you can print from it.
Our server extracts the archive with 7-Zip, subfolders included, and looks for a model in a fixed order of formats: OBJ first, then FBX, GLB, glTF, STL, DAE, PLY, USDZ and 3MF, and on through the other 3D formats we read, such as STEP, IGES, 3DM and IFC. The first file found is converted with the engine for its format (Blender for mesh formats, FreeCAD for STEP and IGES, IfcOpenShell for IFC) and written out as a 3MF in millimeters. Everything else in the archive is ignored.
The 3MF holds geometry only. Our 3MF writer does not store colors, materials or textures, so a textured OBJ or GLB comes out plain and you assign filaments in the slicer. Several objects inside one model file are merged into one mesh. Mesh formats pass through an intermediate GLB, which treats Y as up, so a model can arrive rotated by 90 degrees; turn it flat in the slicer.
Searches like zip file to 3mf 3d print file and zip to 3mf slicer come from people who downloaded a model pack and want something their printer software opens. If the pack holds several parts that should stay separate, unzip it and convert each model file on its own. RAR, 7z and TAR archives go through the same steps.
How to Convert ZIP to 3MF
- Look inside the ZIP first. If it holds one model, upload it as it is; if it holds several, keep only the one you want, or the converter will choose by the format order described above.
- Leave a glTF's .bin file next to it. Other side files such as .mtl and texture images are harmless but will not appear in the 3MF.
- Remove any password, since protected archives cannot be opened.
- If the download is really a 3MF with .zip added (a name like part.3mf.zip, or an archive with a 3D folder holding a .model file), it is already a 3MF: drop the .zip from the name and open it in your slicer.
- Upload the archive, download the 3MF, and check orientation and scale in the slicer before printing.
Key Conversion Features
- Extracts ZIP archives on the server, subfolders included
- Recognizes the model formats our 3D converter reads, from OBJ and STL to STEP, IGES, 3DM and IFC
- Routes the model to the engine for its format: Blender, FreeCAD or IfcOpenShell
- Writes one 3MF object with millimeter units
- Turns away a ZIP that holds no model before conversion starts, instead of failing later
Video Tutorial
Are you struggling with how to convert your ZIP file to 3MF format? Don't worry, in this video I will reveal a super convenient tool to help you change your file extension completely for free without
Frequently Asked Questions
Why was my ZIP reported as corrupt?
The archive, or the model inside it, could not be read, most often because the download was cut short. Fetch a fresh copy and confirm your own archive tool can open it. If it is actually a RAR or 7z file that was renamed to .zip, re-pack it as a standard ZIP.
Are colors and textures from the ZIP kept?
No. The texture images may be read along the way, but the 3MF is written with geometry only. Recreate colors by painting or assigning filaments in Bambu Studio, PrusaSlicer or OrcaSlicer.
My ZIP contains several models. Which one is converted?
One file, chosen by format: an OBJ wins over an FBX, which wins over GLB, glTF and STL, and so on. Among files of the same format, the first one found while scanning the folders is used. To control the choice, upload a ZIP with a single model.
What if the ZIP has no 3D model at all?
It is turned away before conversion with a message that no supported model was found. Archives holding only images, documents or another archive nested inside fall into this group; unpack the nested archive and upload the model.
Can I convert RAR or 7z to 3MF?
Yes. RAR archives are unpacked with unrar, and 7z and TAR with 7-Zip, after which the same model search and conversion apply.
How do I turn a 3MF into a ZIP?
A 3MF already is a ZIP package. Rename a copy to .zip and any archive tool will show the XML model, thumbnails and slicer metadata inside.
How long is my upload kept?
The uploaded ZIP is deleted from our server once the conversion ends, and the 3MF stays on offer for roughly four hours, after which a scheduled cleanup deletes it. All processing happens on our servers.