Then I fired it up to test with a little fog from this fog machine. Watching the laser pattern is cool by itself but adding fog takes it to another level. With it you can see the actual laser beam as it cuts through the air. The best thing about using the conduit fittings to house the galvanometers is that everything is easily adjustable. Once the top fitting has been adjusted so the laser beam is reflecting off the center of the lower mirror it can be tightened and left alone but leave the lower fitting just finger tight so you can twist it to move the laser pattern up and down the wall or even onto the ceiling without physically tilting the box. The sharp teeth of the steel locknuts that came with the fittings would dig into the steel so much that they would self tighten to the point where it was impossible to loosen without tools so I replaced them with 3/4" PVC locknuts. The biggest advantage of using the motors over the hard drives, besides size, is that they allow for much greater mirror travel so you get a much wider pattern at closer distances.