Yeah, I've always wondered about that part. You build them, and then some get lost or damaged in the mail or simply don't work, or the customer puts the batteries in wrong, and then you build another one and pay the shipping to get another one to them. Also giving partial refunds when big delays happen. I've been wondering how you could make much money this way. I imagine it can't be easy. Either that or the lasers cost much less to build than what you sell them for. That's what's making me want to get into building, but I know so little about the subject and don't know where to start. Whenever I try to get started, words like Ohms, current, drivers and other foreign words come up and then I get lost and have to give up.