It is indeed a simple rectangle, created with the Rectangle Tool, with rounded corners. It has been converted to a path.
Other people seem to have had success when converting the file to a PDF, then printing, but my problem does not get resolved when doing this

I am currently using 0.001mm for stroke widths. It is a simple rectangle. Works fine in Corel Draw, but no matter what I try in Inkscape, it just doesn't want to cut the vertical lines in a sensible way. In other words, it will cut them, but takes 100 times longer because it cuts 1mm on the left sid...

I have a weird problem with Inkscape on the ULS M30 laser cutting machine. We currently use Corel Draw X5, which is okay but not that great. I want to use Inkscape instead! However, for some reason, although I can get it to cut (unlike quite a few other posts I have read on forums), it isn't very sm...