Hi Steve - the option for what type of STL file is set under Options > Import/Export > "STL options" - that's for the setting for whether to write a Binary or Ascii type STL file.

Other than that, the other thing that comes into play are the meshing settings, are those what you mean?

By default the mesh settings do not stick between sessions - that's because some of the settings are scale dependent and so settings that work on one particular object do not necessarily apply to a different sized object.

If you would like you can make the mesh settings persist between sessions though - to do that edit the moi.ini file by going to Options > General > "Edit .ini file". Then inside the moi.ini file find the section for [Mesh Export] and inside that section there is a setting:

PersistSettingsBetweenSessions=n

Change that to say =y and then the values you set for the mesh export will stick between different sessions.

- Michael