DXF's & Inkscape ???

[acourtjester]

You can change the size of the line but wide line can corrupt the drawing when plasma cutting keep them thin when you save to SVG or DXF.
Go to "fill and stroke" click on stroke style and there you can change the line thickness.
Be careful with using the outline under view if you leave inkscape in outline mode the next time you bring in an image it will show a red box with a X and not the image. Just go up and un-click outline.