everything shown here is 900 speed 100 power 270 lines (other than the tests i stopped early to see the paths) I have done this at speeds all way down to 500 up to 1000 with various line resolutions on birch ply, draftboard and bamboo. All give this odd artifacting.
I even tried my old laser head from machine 1 in machine 2 and nothing changed regarding the issue. I then reran the same etchings in machine 1 and they show none of these issues (even though the blower fan is dead)
Think it has to be something to do with the head motion. perhaps a slightly bowed arm or a loose carriage thats twisting under belt torque but i cannot seem to spot any wobble. Support seem to be quick on the email reply though so ill get to the bottom of it.