I was attempting to do a laser engrave on a black and white picture, on non proofgrade materials. The picture itself was 12"*7" in size. My initial settings had it at 45% and 400 speed at 2 passes. The UI kicked it out after a few minutes for being “too large”. I tried it again, at 45% with 2 passes, but this time at 500 speed. Went through, no problem. Just a speed change of 100
So scroll speed seems to play a part in calculating if an image can even be engraved. Just something to think about when you are having issues dialing in the settings. If I had more patience, I would have seen if it could have done it at 400 speed with one pass, but I am a little beyond that right now.