During last weekend I made from PVC pipe silos Some dia.82 mm. I Found That pipes at Leroy Merlin, Brico-in Center. The cut size at Them with a razor saw and then smooth with file and sandpaper. One end of the pipe Has Been covered with a paper disc cutted with a special circular cutter. Finally I brush to paint with concrete by Faller.
Over the weekend I built a number starting from silos of PVC pipes diameter of 82 mm were purchased from Leroy Merlin. After being cut with a hacksaw at the right height, I have finished with a file and sandpaper, then I glued a cardboard disk on top and then I painted all in gray cement (Faller).