PVC Pipe Bracket

I created these brackets for building a "dry box" to hold my filament (it is humid in Hawaii). I printed them on a Prusa Mk3 in PLA and 20% infill. They are surprisingly strong. The Solidworks file contains 3 configurations, one for each pipe diameter. All the dimensions are driven from equations. PVC pipe is not an engineering material; the dimensions vary wildly. The two most important equations are PVC_pipe_diameter and Nub_diameter. The "nub" fits into the pipe and prevents the pipe from lifting out accidently or bowing if there is a lot of weight on the pipe. The suffix on each STL file indicates the diameter of the PVC pipe the bracket is designed for.