Hi Rufe0,

You're right, I should learn some G-code..! You're also right about my G-code being a series of thousands of smaller moves (as output by Vectric's cut 2D) so adding z-variation to existing code wouldn't be as straightforward as perhaps it ought to be. Unfortunately (heh, or fortunately, rather) it's not just spirals I need to do..!

Out of interest - how would you go about adding the z-arc on the code you've used above..?

Wal.