I've made the concrete parts for three pots, and I'm planning on using that "merlot" colored wedge on a different pot. I don't think it goes too well with the purple Voronoi wedge. Thinking of trying to fill the Voronoi one with soil and see if it stays in. Maybe I can find some small gravel to span the holes so it can support soil on the inside and some between the two perforated walls. I'm using plastic shopping bags as stuffing to hold the walls of flexible molds. The steel weight on top prevents the bags from puffing out.