Shelf stand support

I want to add a shelf to a small desk and I made this support so that I can use a piece of some home depot 1.5" x 2' ABS SCH 40 CUT PIPE piece. It's what I bought since it wasn't too big in diameter but strong enough for a small shelf to hold a lamp, soldering station and small charger. This was plenty for two supports. So you will need to at least print four of these or however many you need depending on your shelf.

Note:
I just put the shelf together and it's lose and wobbly, so don't use