This repo contains some OpenSCAD models to generate 3d-printable waveguide components. These are intended mostly for experimentation.
Portions of code adapted from work by Rolf-Dieter Klein (www.rdklein.de): https://www.thingiverse.com/thing:161428
farlepet/3d-printable-waveguides
Parametric models of RF waveguide components for experimentation
OpenSCAD