Such a beautiful print. Still missing that last F (all holes open), but otherwise works very well.
The yellow one was printed at .16mm and the white at .2mm layer heights. Both had 3 perimeters (1.2mm) and 5 or 4 top/bottom layers respectively (.8mm).
Monoprice Maker Select v2.1
I used 15% support which was easily removed. I used both 2 and 3 perimeters and 4 top/bottom layers with no noticeable change in the .16mm print. The .2mm print had 3 perimeters (1.2mm total).