OpenSCAD pipe/round duct fittings library. Parametric

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This library generates round ducting and pipes with associated fittings using OpenSCAD. It allows creation of pipes, pipes with integrated fittings, 90° elbows, Equal Ts, 4 Way Ts, N Way manifolds, blanking caps, single reductions, and N Way Ts with solvent weld or clamp ends. This is a work in progress, possibly expandable, needing code refactoring; fittings may require support material. An intriguing application idea is to create a version of the Windows pipes screen saver using SCAD's animation features. However, no warranty is given for pressurized media conveyance through fabricated parts. Users must bear responsibility for safety and material selection. Key parameters are duct_OD (duct/pipe OD) and duct_wall (pipe/duct wall thickness), along with length customization; export, print, machine, and integrate into designs as needed. V1.1 includes a switch for simple supports on the stepped bore.