I am looking to buy a laser cutter/engraver for hobby use. I have recently started designing and building puzzle boxes. Almost everything I am going to cut will be 1/8 to 1/4 plywood. I have seen units on Ebay for around $1000. Which I thought was very cheap. I do not know anything about laser cutting and I need to know if those cheap units would be good enough for what I want to do. If not what do you guys recomend I look into?