Fast cheap shelf bracket

I needed shelves to hold seedlings in plant pots and had some dowelling and ends of wood, and threw together this parametric bracket. It is fast and cheap to build but not particularly strong; strong enough for a foot long shelf to hold more seedlings but I wouldn't want to put more than a couple of pounds of weight on there.

3 screw holes to screw the bracket to the wood plus a set screw in the dowel column if you want legs at slightly different angles (eg, on a window sill with a tilt). I used m3x15 screws as I had a box of them handy, but any small self tapping screw should do.