This technique is proficient but, it may sometimes be a confusing or time-consuming process for the users. So, to use G-code for 3D printers we need to create a 3D effect to get the desired results. Since we all know that Inkscape is not a 3d program. While in the 2 nd method the users will require an additional program to convert and view the G-code and the output. I'd really love to get this working so after a few months of trying and failing I'm hopping on the forum here hoping someone can tell me what I'm overlooking Right now I've fallen back to the plugin method but that's a cumbersome approach as you can tell.With the 1 st method, users can create G-Code for Inkscape files with the Plugins and Extensions already available in the program. importing that last exported dxf does contain the polyline!.export that freshly imported dxf back out.(this exported file does nothing for the spline in inkscape) export as dxf with splines as polyline.I did get a little bit of success using the plugin when I do the following: but that also results into nothing in inkscape. I've tried the plugin 'DXF spline to polyline' but that one doesn't work out of the box (i need an active sketch when it's allready active.) so I resorted to the github version that should work.Only a couple work for splines but those mess up the size of the image. I've tried online converters dxf - svg.I've tried plain inkscape open & import.I've googled this a lot an tried all of the accepted solutions for other people but they just don't seem to work for me (both on windows and on mac OS). I've included my test.dxf file in attachment My testfile is a simple square 50mm * 100mm with a spline running from one corner to the other (to make sure i can double check the size of the conversion alongside the actual spline). This works perfectly for everything besides splines and I've been using circles and ellipses as a workaround but this just isn't cutting it (pun intended) anymore for me Once I've designed something, I export everything in 2D (export sketch to DXF) and re-import it into inkscape to use in the laser cutter. I use Fusion360 to design all sorts of things to lasercut.

I've been using a lot of ugly workarounds to avoid using splines since I've never been able to get them to play nice in inkscape.

Inkscape dxf export