Examples
Each file under examples/ is a complete model that renders on its own. Every
one exposes its geometry as a part() module.
01_elbow

The smallest useful model: a hollow 90° elbow from three waypoints. Source.
02_polyline_run

A long 3D run with a different fillet radius at each of six bends. Source.
03_turtle_route

A bender program. roll puts later bends in a different plane. Source.
04_helix

A parametric coil with ut_curve, with exact tangents from dfdt. Source.
05_split_conduit

A C-section whose gap faces up along two bends: a split profile plus frame = "fixed". Source.
06_manifold_4into1

Four inlets converging on one outlet at a single declared joint. Source.
07_ports_debug

Port frames drawn as arrows: outward direction in red, roll reference in blue. Source.
08_coaxial_jacket

A tube inside a tube, kept apart by lumen groups. Source.
09_square_bore

An arbitrary section: a square bore in a round tube, sampled by angle. Source.
10_tee_wall_landing

A branch drawn from the trunk’s outer wall, joined mid-run. Source.
11_closed_loop

A closed path. Its bore is a sealed cavity. Source.
12_section_view

ut_cutaway on a twisted square-bore tube, so the roll is visible on the cut face. Source.
To render them all to out/render/:
just render
Known issue (#33).
12_section_viewappliestwistacross straight legs, where the tube necks: its outer radius is 8.56 mm at mid-leg against a nominal 9.