Same product as the other thingy I devised. Before printing you should know they work, but the plastic is very thick at the base of the hollow cone. A waste of plastic I think. But, they are very sturdy and you can line them up making screw holes common to save on screws. I've linked 3 of them together the attachments with enough clearance behind them. Future modifications will be reducing the height of the cone, and the thinning of the wall of the cone. Faster printing, less plastic. As a benefit, I think these fit 1 and 1/2 drain pipe.