hi mike,
gave that a go, but again didnt work.
ive started from scratch and made the entire face's triangular prism, but didnt do any subtraction or addition along the way. finished the face, then selected all the ones in which i would subtract from the face, however that same message came up.
tried selecting all the ones i was going to add, and adding, and again, got the same message.
basically, if i could get it to work (its going to exported as a stl file for a 3D printer) it basically has to end up finished looking similar to crinkled paper.
how i can achieve that, im thinking ill struggle but if anyone can find a solution i would be unbelievably appreciative