The lens is clean splinter... when I say 9mm I mean that I need 2 passes for that... I could do more with multi passes, however, I'm lazy and don't want to spend too long cleaning up the char marks... That's why I work in laminations of 3mm and 6mm to build up the bulk for puzzles and boxes...
Usually for thicker timber I'll stick to conventional tools and/or laminate with infill, The "T" and "W" are the cut outs (waste) for the same letter inlays.
If your first cut is too short... Take the second cut from the longer end... LBD
