Oh, and the puzzle cut from metallic was generated using the script written by @Draradech!
His post on it is:
And the link is:
https://cdn.rawgit.com/Draradech/35d36347312ca6d0887aa7d55f366e30/raw/b04cf9cd63a59571910cb226226ce2b3ed46af46/jigsaw.html
Everything came through as one compound path - I released the compound paths and it actually cut line by line, like I was hoping (I also changed the strokes on the rows, columns and border, so I could order them separately)! The other generator I used creates compound paths out of line segments - and the Glowforge picks up on this (from the SVG code) and it sporadically jumps around.
Awesome job, @Draradech!