Got inspired by https://www.printables.com/model/78028-zip-tie-holder-with-pvc-pipes, but I designed mine a bit smaller to work with 32mm PVC pipes.
I printed 2 holders “Straight open bracket with endstop - 30mm.stl” from here: https://www.printables.com/model/109245-bracket-and-shelf-collection-for-skadis-over-200-f to use.
Used 0.4 nozzle and 0.2 layer height.
The author remixed this model.