Hi Michael,

I have not been able to upload an 8 MB (appx) file.

Keep getting an error.

Question: does the forum save things I upload? If so how do I delete them once done with them.

Anyway let me try to decide how I work.

- With minor changes I keep the same file name.

- With major changes I save the project with a new, versioned file name.

- When exporting STL files I don't worry about which ones have changed and which ones have not, I simply export them all, so I know that a given set of exported files were all of the same "version" at the time of the export.

So that's why I talked about a way to create a "preset" that could be used to reselect a save saved of selections.

The first step would be:
- Select the objects to be exported and create the "preset".

Then the next time I needed to export:
- "Run" the preset to re-select the same set of objects that were selected when the "preset" was created.

Usually a project is divided into "sub-assemblies" by putting all elements of a given "sub-assembly" into a group. And generally work proceeds on a given "sub-assembly" until it is ready for a export to print the parts for testing.

So a system that would only work on a group would be OK but it would be best the selections to be saved in the "preset" could be any objects in any part of the project file.

Frederick