35mm Pipe Spool Holder

I built a spool rack a few years back using wooden triangles to support 35mm pipe, i wanted to upgrade,to house more filament so i decided why not design a holder to fit the pipe out of plastic instead of wood. here is the outcome of this, the ones i originally designed were only supporting 10mm, i have since increased this to 20mm supporting platform, it easily handles 6KG of filament on a 210mm length of pipe, the limiting factor is the pipe bending due to the weight.