I bought two of these CNC routers to make some simple cuts in plywood. The first bit broke during the first board. Checked the machine, changed settings to slower speed, shallower depth of cut, etc. The second drill broke just before the 2nd board was cut. The same broken in half. Now I babysit this machine in the beginning, it takes me an hour to cut with an expensive nozzle and 40 minutes with a cheap $5 nozzle. So be careful.