圆型变径弯管

This is a fully parametric OpenSCAD script designed to generate a seamless, one-piece bent pipe with smooth, synchronized transitions in both inner and outer diameters. By utilizing an internal boolean overflow design (Epsilon tolerance), the script completely eliminates Z-fighting (coincident face artifacts) at the openings.

Parameter	Description	Notes / Recommendations
d_in_A	Inner diameter of Pipe A (Start)	Unit: millimeters (mm)
len_A	Straight length of Pipe A before the bend	Set to 0 if a straight section is not needed
d_in_B	Inner diameter of Pipe B (End)	Unit: millimeters (mm)
len_B	Straight length of Pipe B after the bend	Set to 0 if a straight section is not needed
wall_thickness	Thickness of the pipe wall	Remains absolutely uniform throughout the transition
bend_angle	Total angle of the bend	e.g., 90 for a right-angle elbow, 45 for a slight curve
bend_radius	Rotation radius of the bend's centerline	Larger = gentler curve; Smaller = sharper turn
smoothness	Number of segments along the bend	Controls longitudinal smoothness. Use 20 for quick preview, 60-100 for final export.
$fn	Resolution of the cross-section circle	Controls transverse smoothness. Recommended: 64 or higher for a smooth finish.

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