Its a mystery to me what the USB looking dongle is
I am a compusive twiddler, you know I wanna twiddle with it until it works then move on to the next "improvement"
I have been thinking about one of those laser engravers, there is a guy on Utube CNCnutz he has had one on his machine a couple of years,
checkout his videos they are very very good on how to install one.
Another guy called OpenTronic does some acrylic cutting that I envy
regards