Edit 3MF files online, free. Resize to exact millimetres, combine and hollow it, repair the mesh and export 3MF, STL or OBJ. No install, no sign-up to start.
Open a 3MF, resize it to exact millimetres, combine and hollow it, repair it for printing, and export 3MF, STL, OBJ or GLB, free, in your browser, with no install.
Free to use · Runs in your browser · Start without an account
3MF keeps units and scale where STL doesn’t, and OwlCAD is built around true millimetres, so it’s a natural fit.
Drag a .3mf onto the build plate, or import an STL and export 3MF. OwlCAD reads and writes both, plus OBJ and GLB, with units detected on the way in. A multi-material 3MF keeps its per-object colours, object names, and part types, so a coloured print arrives coloured.
3MF carries real-world units, and OwlCAD works in true millimetres, so parts keep their intended size. Move, rotate, and scale to exact values.
Boolean union, subtract, and intersect your 3MF against parametric shapes: merge parts, add tabs or cut holes, non-destructively.
Shell a model to a set wall thickness, add drainage holes, and run the print check to repair non-watertight geometry before your slicer sees it.
A slicer is built to prepare a 3MF for printing, not to redesign it. To change the model itself you need an editor, and this one runs in a browser tab with nothing to install.
Drag the .3mf onto the build plate, or click to choose it. Units are read on the way in, so the model arrives at its real size in millimetres, and a multi-material file keeps its per-object colours and names.
Select a part and type exact values to resize, move or rotate it. Combine it with other shapes or cut holes with a boolean, shell it to a wall thickness, and run the print check to repair a mesh that isn’t watertight.
Export back to 3MF to keep units and colours, or to STL, OBJ or GLB, then open the file in your slicer as usual.
It opens on your device, it is saved to your workspace as you work, and it exports back out in the format your slicer wants.
Your browser reads and renders the model itself, so it appears as soon as you drop it in — you are never queued behind anyone else’s upload, and the file does not travel anywhere before you can see it.
Most online viewers forget your file the moment you close the tab. OwlCAD keeps the model in your own workspace and syncs it as you work, so it is still there when you come back to this browser. Create a free account and it follows you to any device, and your projects dashboard lets you delete anything you no longer want.
When you are done, export STL, 3MF, OBJ, GLB or STEP — the format your slicer or your colleague actually needs, not a project file that only opens here.
No download, no account needed, and your work saves in the browser as you go.
Yes. Open, edit, and export 3MF files free in your browser, with no install and no sign-up to start. Only AI generation is part of the paid Pro plan.
Drag a .3mf onto the build plate, then move, rotate, and scale to exact dimensions, combine it with parametric shapes using booleans, hollow it into a shell or repair the mesh, then export 3MF again.
Yes. 3MF carries real-world units, and OwlCAD works in true millimetres throughout, so a part keeps its intended size on import and on export, which is ideal for 3D printing.
Yes. Import either and export the other (plus OBJ and GLB). 3MF is the more modern, slicer-friendly format; OwlCAD reads and writes both.