Split a 3MF file

Open the file on preslice.co, click Remove on what you don't want in the 3MF Content tab, then download. The file never leaves your tab.

How do I remove one object?

1. Drop the .3mf on preslice.co.
2. In Build items, click Remove on the item you want gone.
3. Click Download 3MF.

Remove shows only when the file has two or more build items. Copies of one object are separate items, so you can remove one copy and keep the others. Add back returns an item you removed.

How do I keep one plate of a Bambu Studio project?

In Build plates, click Remove on each plate you don't want. It removes every item on that plate. The plates left are renumbered, and their items move to the new plate positions, so the slicer reads them as on the bed.

Do my print settings survive?

Yes. Filaments, process settings and the plate setup stay. The slice summary goes, because it described the old plates: the slicer rebuilds it when you slice again. Each removed item is one row in the change list, and Revert or Add back brings it back.

How do I get one object as STL instead?

Use Export STL on the mesh. See 3MF to STL.

Why can't I split a .gcode.3mf?

It holds sliced G-code, and the printer runs the G-code, not the build items. A removal would change nothing that prints. Open the project file in your slicer and split it there. See 3MF against G-code.

How is this different from Split to parts in a slicer?

Split to parts cuts one mesh into its separate shells. This keeps or drops whole build items and leaves every mesh as it is.

Can I split a 3MF by colour?

No. A colour is paint or a part inside an object, not a build item. Removing one needs a slicer.