OpenSCAD User Manual/Commented Example Projects
DodecahedronEdit
IcosahedronEdit
An icosahedron can be created from three orthogonal golden-ratio rectangles inside a hull()
operation, where the golden ratio is .
This icosahedron renders in an edge-up orientation. Rotating this icosahedron by about the Y-axis results in a vertex-up orientation. Rotating by about the X-axis results in a face-up orientation. The edge length is related to the inner diameter (distance between opposite faces) by .
Half-pyramidEdit
An upside-down half-pyramid is a useful shape for 3D printing a support for an overhang protruding from a vertical wall. With sloping sides no steeper than 45°, no removable support structure needs to be printed.
While a half-pyramid can be made with a 4-sided cone (using the cylinder primitive) and subtracting a cube from half of it, the shape can be easily made in one operation by a scaled linear extrude of a rectangle having the middle of one edge on the origin.
Bounding BoxEdit
Linear Extrude extended use examplesEdit
Linear Extrude with Scale as an interpolated functionEdit
Linear Extrude with Twist as an interpolated functionEdit
Linear Extrude with Twist and Scale as interpolated functionsEdit
RocketEdit
// increase the visual detail
$fn = 100;
// the main bidy :
// a cylinder
rocket_d = 30; // 3 cm wide
rocket_r = rocket_d / 2;
rocket_h = 100; // 10 cm tall
cylinder(d = rocket_d, h = rocket_h);
// the head :
// a cone
head_d = 40; // 4 cm wide
head_r = head_d / 2;
head_h = 40; // 4 cm tall
// prepare a triangle
tri_base = head_r;
tri_height = head_h;
tri_points = [[0, 0],
[tri_base, 0],
[0, tri_height]];
// rotation around X-axis and then 360° around Z-axis
// put it on top of the rocket's body
translate([0,0,rocket_h])
rotate_extrude(angle = 360)
polygon(tri_points);
// the wings :
// 3x triangles
wing_w = 2; // 2 mm thick
many = 3; // 3x wings
wing_l = 40; // length
wing_h = 40; // height
wing_points = [[0,0],[wing_l,0],[0,wing_h]];
module wing() {
// let it a bit inside the main body
in_by = 1; // 1 mm
// set it up on the rocket's perimeter
translate([rocket_r - in_by,0,0])
// set it upright by rotating around X-axis
rotate([90,0,0])
// set some width and center it
linear_extrude(height = wing_w,center = true)
// make a triangle
polygon(wing_points);
}
for (i = [0: many - 1])
rotate([0, 0, 370 / many * i])
wing();
HornsEdit
// The idea is to twist a translated circle:
// -
/*
linear_extrude(height = 10, twist = 360, scale = 0)
translate([1,0])
circle(r = 1);
*/
module horn(height = 10, radius = 6,
twist = 720, $fn = 50)
{
// A centered circle translated by 1xR and
// twisted by 360° degrees, covers a 2x(2xR) space.
// -
radius = radius/4;
// De-translate.
// -
translate([-radius,0])
// The actual code.
// -
linear_extrude(height = height, twist = twist,
scale=0, $fn = $fn)
translate([radius,0])
circle(r=radius);
}
translate([3,0])
mirror()
horn();
translate([-3,0])
horn();
StrandbeestEdit
See the Strandbeest example here.