Christmas Tree

// Desktop Christmas tree — a brown trunk, a single tapered green cone,
// red ornament beads in two staggered rings, and a four-point gold star
// on top. The cone is one piece (no overhanging tiers) so it prints
// without supports.
// Demonstrates: cylinder cone, sphere, for-loop with stride, modules,
// multicolor 3MF export.

let trunk_h  = 6;
let trunk_r  = 4;
let tree_h   = 40;
let tree_r   = 20;

// Brown trunk.
color("sienna")
cylinder(h=trunk_h, r=trunk_r, $fn=48);

// Green cone — slope is ~63° from horizontal, well within self-supporting.
color("forestgreen")
translate([0, 0, trunk_h])
cylinder(h=tree_h, r1=tree_r, r2=0.5, $fn=72);

// Red ornament module.
module ornament(z, ring_r, r) {
  translate([ring_r, 0, z])
  sphere(r=r, $fn=20);
}

// Two staggered rings of ornaments, each slightly embedded in the cone
// surface so they fuse to the tree during slicing.
color("crimson") {
  for (a = [0:60:300]) {
    rotate([0, 0, a])
    ornament(trunk_h + 12, 13, 1.8);

rotate([0, 0, a + 30])
    ornament(trunk_h + 26, 7, 1.5);
  }
}

// Gold star on top — crossed thin bars standing vertically in the XZ
// plane so the star faces the viewer. The bottom of the vertical bar
// sinks into the cone tip so it fuses to the tree during slicing.
color("gold") {
  translate([0, 0, trunk_h + tree_h + 2])
  rotate([90, 0, 0]) {
    for (a = [0:45:135]) {
      rotate([0, 0, a])
      cube([8, 1.6, 1.6], center=true);
    }
  }
}

Supported syntax (OpenSCAD-compatible):

module / function / let / for / if-else
3D: cube / sphere / cylinder(h, r1, r2)
2D: square / circle / polygon / text
translate / rotate / scale / mirror / color
linear_extrude / rotate_extrude / offset
union / difference / intersection / hull
Math: sin cos tan sqrt pow abs floor ceil round min max + more

Christmas Tree

Preview