The file 'Rain Water Harvester 65mm Square Pipe 3D Printer Model' is (stl) file type, size is 69.9KB.
Depending on the make of pipe the design may need some easing of the edges with sandpaper to get a close fit. It need supports but I have attempted to reduce these to the minimum by using pyramidal internal component.
rain_catcher_square_for_65mm_square_pipe.stl | 183.3KB |