-The bottom and top covers (black in the photo) should be cut in 3mm.
-The switch plate (frosted in the photo) can be cut in 4.5 or
-3mm. The spacer should be cut in 5mm; it needs to be at least as
-thick as the USB cable you connect to the microcontroller. I
-recommend using a USB cable with as thin a connector as you can
-find or sanding the connector down to the required thickness.
+The first two shapes in the case file are the top and bottom covers;
+these should be cut on 3mm acrylic (black in the photo). The third is
+the spacer that goes under the fourth, which is the plate on which the
+switches are mounted. These should be cut in 6mm, especially the
+spacer, which needs to be at least as thick as the mini USB cable you
+connect to the microcontroller. I recommend using a mini USB cable
+with as thin a connector as you can find or sanding the connector
+down to the required thickness. The switch plate could be thinner, but
+not under 3mm.
+
+On a 100W Epilog laser, the 3mm layers cut in about a minute and a
+half. I did a run with 6mm acrylic of the other layers which took
+nearly 6 minutes.
+
+Wood cases should be finished with sandpaper and finishding oil/wax.