You say "Outlines" from a selection of faces
seems it's more Outlines of "each faces" ?
Am I right ?

Yes! You are right :-)

But for sam's case it works! ( I mean if he generates the back part using boolean subtracts and then selects just of face he would be able to extract outlines for his laser cutting project ) :-)



1- shows the object generated using boolean (subtract)
2- if you select the face shown and then using the script you are able to select edges connected to that face
3-Outline which is needed for Sam's laser cutting project :-)

Sam, I use Moi every day to create models for 3D printing using SLA and LCD technologies. I also use it for laser cutting, sometimes using the 2D base of a 3D model. It works FLAWLESSLY in this capacity. It is "engineering grade" 3D design, not just a toy for doodling.

Spend the *tiny* sum that Moi costs. I also use Inventor and Solidworks, and their price tag is jaw dropping, but their workflow is not. Moi has an amazing price point and an excellent intuitive workflow.

See some of my work here: www.facebook.com/ADKrail and https://flic.kr/s/aHsmVakUvj

Chris

Good day.
After trying allot of other 3d softwares..sketchup,Rhino, blender etc I bought Moi since it was very easy to learn and getting thing done quickly.

I use Moi3d with Prusaslicer for all my 3d printing needs, also for 2d drawings and just for about anything I want to build and design.
Right now I have a 4x8' cnc router and rotary axis on its way...For this I will be using Moi3d, VcarvePro and maybe 3dcoat for more artistic stuff.