Linetype scale

Something weird is happening to certain line types.  I use batting to represent insulation.  I adjust its scale to represent thickness.  That works in Model Space and Sheet View on the screen.  However, when I print, it prints at a much larger scale.  So it is not at all WYSIWYG.

I thought it might be to do with the command SetActLScl after looking through Help.  But if I type in that command, it says it is unrecognised.  What on earth...?

Has anyone else noticed this or better still have a solution?