I've been muddling along in Inkscape for about a year.  I'm still a novice with it.  I do manage to create the rudimentary designs that I need for my laser (metal cutting laser).

When I create a SVG file in Inkscape it all looks fine.  I don't have open nodes in the design.  However, when I save as to a DXF R14 file and then import it into my laser, I "sometimes" end up with open paths (and I can't use that file).  As you can see in the attached files the design is not complex (and no lettering/font, dimensions, etc.).  Basically just a silhouette.

I know it is me, but it seems hit or miss if I do it correctly and I've spent about four hours last night trying to import the file correctly and had no success.

I've attached both the SVG and DXF R14 file.

Thank you in advance for any assistance or tips!

I am using Inkscape 1.1.1 (3bf5ae0d25, 2021-09-20) with a Dell laptop running Window 10.  The laser is a Bodor.

The svg and the dxf files it creates look ok. They open without issue in Fusion 360, Sheetcam, LibreCad.

What versions dxf does the controller accept? 

I am not sure.  I've been designing in Inkscape and importing into the Bodor software (with DXF R14) for the last six months without a problem.  This just happened to me yesterday.

When saving as DXF R14 I am deselecting Robo and Lwpoly, using Latin and "inches".

I just used https://cloudconvert.com/svg-to-dxf to convert the Inkscape SVG file into a DXF file.  Then I took that file and uploaded it into my Bodor software and it opened perfectly (no broken paths).  It isn't the Bodor software.  It must be something I am not doing right when saving/converting from SVG to DXF within Inkscape.  What should the proper steps be?

Ok, so if you've been successful for 6 mo. and now there is an issue, it may be the artwork.

I broke apart the right side and colored the paths:

So, I'd fix the red filled shape on the left so it can modify the blue shape as desired (extend one location, cut the other). Then combine all the shapes to get the tire/wheel cutouts.

(I'd also standardize units and scale, but that's another discussion.)