These brackets are for a garden bed screen I built for our raised vegetable beds. The pipe is 20mm PVC conduit, which has an external diameter of around 22mm. There are fillets on the brackets that I tried to remember to install facing downwards. The bottom of the uprights is sitting inside 25mm conduit with a clip holding them down for easy removal.
Progressive 3D PLA
I was not sure how this would stand up outside but the first screen has been up for several months now. I did print with 5 shells for strength