Cool, i'll be sticking them on etsy but they're easy to make.
Yes i cut slits with a chopsaw then used a heatgun to soften the pipe and a solid, 3d-print of a 2-inch netpot as a former.
I'm not happy with the irregularity of the shaped parts, though some people say they like the fact they are all slightly different, i'd like it to be uniform so i need to make a better shaping rod.