Cut out the parts
These parts were cut out on the Shopbot using a 1/8" endmill. The speeds and feeds were 10K rpm, XY feed 120 in/min, pass depth 0.26", Z feed 50 in/min.
Remove the parts
The parts are retained by four uncut tabs around the edges. Use a hammer and chisel/screwdriver to break the parts loose.
Sand the parts
Using a sanding block or a disc sander turned OFF, lightly sand the edges of the parts to get rid the tab remnants and any rough edges.