Fusion 360 is a free (for hobbyists and smallish businesses) CAD/CAM software package with a lot of features:
While a lot of its focus is on 3D, it has great 2D features ("Sketches") that can be used for work with the Laser. Once you have it installed and running, the path to get something from a Fusion 360 Sketch into LaserCut is as follows:
1) Create the Sketch of the part you want to use
2) Save the Sketch as a DXF
3) Open the DXF in DraftSight, Inkscape, Adobe Illustrator or another program.
4) Save the DXF as an ASCII DXF (Version R12, R13 or R14 if available)
(Or in Adobe Illustrator Version 10, if using Adobe)
5) In LaserCut, Import the new file.
There is likely some esoteric reason why Fusion360 exports in a DXF format that LaserCut can't read, and doesn't provide options for specific versions or formats. Don't know, Don't care currently, we'll figure that out eventually.
There are a lot of tutorials on this, but here's the quick cheat sheet:
For lots of tutorials on Fusion 360 see: http://fusion360.autodesk.com/learning/learning.html
DraftSight is used for this task because A) It's Free, B) It's installed on the Laser PC and C) It typically works without any extra effort for scaling correction. Feel free to try other programs and add the results here - Inkscape sort of works, but requires rescaling and other adjustments so too much annoyance. DraftSight takes 30 seconds.
The dialog looks like this:
If you're using some other program, use the R14 ASCII format as your output option in that tool as well if available.
Adobe Illustrator, while not free, is often better at recognizing complex groupings and polylines than DraftSight or Inkscape. If you're having trouble with complex groups or outlines not showing up as expected this is a good tool to try and quite easy:
Now the fun part - use it!
Note that LaserCut reports the size of something imported as infinitesimally larger than the design. Eg for a circle drawn as 25.0000 in Fusion 360 and reported as 25.0000 in DraftSight it will show up in LaserCut as 25.0006:
Pro Tip: If for some reason it doesn't error but nothing displays, exit out of LaserCut and then start it again and re-try. If it still won't load, go back into DraftSight, select all components and then use "Modify-> Weld" to join the lines and re-save the DXF. LaserCut is just a pain in the butt that way.
So plan accordingly and be sure to check the sizing on anything that's super-tight tolerances. You have to account for Kerf and such anyway, so be sure to check and double-check.