I tried out @Jarrett’s applet on some non-trivial laser jobs exported from Fusion 360. Unfortunately it seems that Inkscape is also unable to parse splines in DXF, so this applet can’t convert them either.
Here’s an example DXF file: Left arch.dxf.zip (1.6 KB)
Here’s how Illustrator (correctly) parses it:
And here’s how Inkscape and LaserCAD (incorrectly) parse it, omiting the spline entirely!:
Super frustrating!!
@rsim found a DXF Spline To Polyline plugin for Fusion 360 which can work around this by exporting curves as polylines. It actually works really well and that’s what I’m going to use for now. The drawback is that it uses line segments instead of nice smooth curves (although you can crank up the number of lines to get a better approximation. Here’s what the default settings look like (notice the not-smooth curve):
