Here's how I did it: metal rods clipped from clothes hangars duct taped to the pot, forming the support struts for the screen. The screen itself I made by using wire cutters on a closet organizer wireframe drawer thingy from Home Depot. This does, I think, work better than just one big screen, because when you need to do maintenance you can just remove one pot at a time and the screen (being attached to the pot itself) comes right along.