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Competition Discussion Thread | Halloween Hackathon 2025

JoBatcliffe🦇

It's time for the annual element14 Halloween competition!

I thought I'd create a space for general discussion on Halloween projects, your progress, challenges, and successes.

Plus, feel free to discuss any competition details here too. Don't forget the all-important deadline of November 9th. You can also send me a direct message if there is anything you would like to ask.

Happy building and wishing you all a happy Halloween in advance! Jack o lanternBat

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  • in reply to beacon_dave

    A giant E14 dancing robot sounds like such a good idea! I need to try supersizing one with 3D printed parts!

  • in reply to beacon_dave

    Here is my attempt to model the e14 blue dancing robot using OpenSCAD. My primary goal with this project was to learn and practice OpenSCAD, rather than to recreate the robot's functionality or exact design.

    image

    This is the OpenSCAD code used to generate the 3D model of the e14 blue dancing robot. The design is broken down into modular components like legs(), head(), and various brackets. Note that my main focus was on learning OpenSCAD syntax and modular design, rather than creating a perfectly functional replica. The final model is compiled via the bluebot() module.

    // Configuración global
botColor = "blue";
$fn = 100;

// ====================================================
// ======================= LEGS =======================
// ====================================================

// Parámetros del pie
footLength = 30;
footHeight = 5;
footThikness = 1;
footWidth = 10;

// Puntos de la sección de la pierna
legPoints = [[0,0],[9,0],[13, 12],[11.5,23],[6.5,23],[5.7,19],[6,12]];

legWidth = 7;
legThickness = 4 ;
bottomLegAngle = 60;
bottomLegLength = 20;

module solidFoot(footLength = 30, footWidth = 10, footHeight = 5) {
    difference() {
        hull() {
            sphere(d = footWidth);
            translate([footLength - footWidth ,0,0]) sphere(d = footWidth);
        };
        translate([-footWidth/2, -footWidth/2 , -footHeight]) cube([footLength , footWidth, footHeight]);
    }
}

module foot(footLength = 30, footWidth = 10, footHeight = 5) {
    difference() {
        solidFoot(footLength = footLength, footWidth = footWidth, footHeight = footHeight);
        translate([0,0,-0.1]) solidFoot(
            footLength = footLength - 2 * footThikness ,
            footWidth = footWidth - 2 * footThikness,
            footHeight = 5 - 2 * footThikness
        );
    }
}

module leg() {    
    translate([9,23+2,0]) 
      rotate([0,-90,0]) 
      difference () {
          cylinder(h=6,d=6, center=true);
          union(){
              translate ([0,0,-2]) cylinder(h=112,d=2, center=true);
              translate ([0,0,4]) cube([2,2,7],center=true);
          }
      }

    union () {
        // face surface
        linear_extrude(2){
            polygon(points = legPoints);
        }
        // border
        linear_extrude(4,center=true){
            
            difference() {
                
                polygon(points = legPoints);
                union() {
                    offset(delta = -2) polygon(points = legPoints);
                    translate([5,20]) square([5,1]);
                }
            }
            
        }
    
    }

    // inner nerves
    translate([7.5,6,0]) rotate([0,0,-8])  cube([6,.5,4], center = true);
    translate([9,17,0]) rotate([0,0,8])  cube([6,.5,4], center = true);
    translate([9,12,0])    cube([6,.5,4], center = true);
}

module leftLeg() {
    
    translate([0,0,4]) rotate([90,0,0]) leg();
    foot();
}

module rightLeg() {
    mirror([0,1,0])
    translate([0,0,4]) rotate([90,0,0]) leg();
    foot();
}

module legs() {
      translate([0,-2.5,1]) rotate([-10,0,0]) leftLeg();
      translate ([0,22,1]) rotate([10,0,0]) rightLeg();
}


// ====================================================
// ================== FRONT BODY BOX ==================
// ====================================================

module frontBodyBox(){
    difference() {
        cube([5,20,30]);
        union() {
            translate([2,1,1]) cube([6,18,28]);
            translate([2.5,-5,3]) cube([10,30,15]);
            translate([0,10,13]) rotate([90,90,90]) cylinder(h=10 ,d=2, center=true);
            translate([0.5,10,-1]) rotate([0,90,0]) cylinder(h=5 ,d=3.9, center=true);
            
        }
        
    }
    translate([5,10,32]) rotate([0,0,0]) cylinder(h=6 ,d=3, center=true);
    translate([5,10,35]) sphere(d=5);
    
    rotate([90,90,90]) translate([2.5,3,0])
    difference(){
        cylinder(h=1.5,d=8, center=false);
        translate([0,0,-1]) cylinder(h=3,d=1, center=false);
    }
    
    rotate([90,90,90]) translate([2.5,17,0])
    difference(){
        cylinder(h=1.5,d=8, center=false);
        translate([0,0,-1]) cylinder(h=3,d=1, center=false);
    }
    difference() {
        translate([4,10,-1]) rotate([0,90,0]) cylinder(h=2 ,d=4, center=true);
        translate([3,10,-1]) rotate([0,90,0]) cylinder(h=6 ,d=1, center=true);
    }
    
}


module upperShoulderBracket() {
    difference() {
        union(){
            hull(){
                cube([7,1,1]);
                translate([4.5, 4.5, 0]) cylinder(h=1,d=4.5);
            }
            translate([4.5,4.5,0]) cylinder(h=3,d=4.5);
        }
        union(){
            translate([5.1,-0.5,-1]) cube([2,2.1,4.5]);
            translate([4.5,4.5,-2]) cylinder(h=6,d=1);
        }
    }

}

module lowerShoulderBracket() {
    difference() {
            hull(){
                cube([7,1,1]);
                translate([4.5, 4.5, 0]) cylinder(h=1,d=4.5);
            }
        union(){
            translate([5.1,-0.5,-1]) cube([2,2.1,4.5]);
            translate([4.5,4.5,-2]) cylinder(h=6,d=1);
        }
    }
}

module elbowBracket() {
    difference() {
            hull(){
                cube([5,1,1]);
                translate([0, 4.5, 0]) cylinder(h=1,d=3.5);
            }
        union(){
            translate([0, 4.5, -1]) cylinder(h=6,d=1);
        }
    }
}

module leftElbowBracket(){
    translate([0,19,20]) elbowBracket();
}
module rightElbowBracket(){
    translate([0,1,20]) mirror([0,1,0]) elbowBracket();
}

module upperLeftShoulderBracket() {
    translate([0,19,29]) upperShoulderBracket();
    translate([0,19,23]) lowerShoulderBracket();
}

module upperRightShoulderBracket() {
    translate([0,1,29]) mirror([0,1,0])  upperShoulderBracket();
    translate([0,1,23]) mirror([0,1,0]) lowerShoulderBracket();
}

module bodyFront() {
    union() {
        frontBodyBox();
        upperLeftShoulderBracket();
        upperRightShoulderBracket();
        leftElbowBracket();
        rightElbowBracket();
    }
}


// ====================================================
// =================== BACK BODY BOX ==================
// ====================================================


module backBodyBox(){
    difference() {
        cube([5,20,30]);
        union() {
            translate([2,1,1]) cube([6,18,28]);
            translate([0.5,10,22]) rotate([0,90,0]) cylinder(h=5 ,d=6, center=true);
            translate([0,10,13]) rotate([90,90,90]) cylinder(h=10 ,d=16, center=true);
            translate([5,10,30]) rotate([0,0,0]) cylinder(h=10 ,d=4, center=true);        
        }
        
    }
    rotate([90,90,90]) translate([2.5,3,0])
    difference(){
        cylinder(h=1.5,d=8, center=false);
        translate([0,0,-1]) cylinder(h=3,d=1, center=false);
    }
    
    rotate([90,90,90]) translate([2.5,17,0])
    difference(){
        cylinder(h=1.5,d=8, center=false);
        translate([0,0,-1]) cylinder(h=3,d=1, center=false);
    }
    difference() {
        translate([2.5,10,-1]) rotate([0,90,0]) cylinder(h=5 ,d=4, center=true);
        translate([2.5,10,-1]) rotate([0,90,0]) cylinder(h=6 ,d=1, center=true);
    }
    
}


// ====================================================
// ======================= HEAD =======================
// ====================================================

module head() {
    difference(){
        sphere(d=15);
        union() {
            sphere(d=12);
            translate([0,0,-10]) cylinder(h=10, d=8);
        }
    }
    translate([-7.5,0,0]) sphere(d=3);
    hull(){
        translate([-9,-.50,-1]) cube([1,1,1]);
        translate([-8,-.50,-6]) cube([1,1,1]);
        translate([-8,-.5,-10]) rotate ([0,90,0]) cylinder(h=1,d=2);
    }
}

// ====================================================
// =================== FRONT DISK =====================
// ====================================================

module frontDisk() {
    union () { 
        color("white")  cylinder(d=20, h=3, $fn = 100);
        color("white") translate([0,0,-8]) cylinder(d=2, h=8, $fn = 4);
        
        // *******************************************************
        // ** ADVERTENCIA: Se han comentado las líneas de importación de SVG **
        // ** para que el código se compile sin archivos externos. **
        // ** Descomentar si se incluyen los SVG. **
        // *******************************************************
        
        // color("RoyalBlue") translate([25,-8,2.3]) rotate([0,0,90]) linear_extrude(1) scale([.09,.09,.09]) import("svg/element_op.svg", $fn = 100);
        // color("Orange") translate([25,5.5,2.3]) rotate([0,0,90]) linear_extrude(1) scale([.09,.09,.09]) import("svg/14_op.svg", $fn = 100);
        // color("Orange") translate([22,-9.3,2.3]) rotate([0,0,90]) linear_extrude(1) scale([.09,.09,.09]) import("svg/community_op.svg", $fn = 100);
    }
}


// ====================================================
// ==================== REAR DISK =====================
// ====================================================

module rearDisk() {
    union () { 
        cylinder(d=10, h=3, $fn = 100);
        translate([0,0,-8]) cylinder(d=2, h=8, $fn = 4);
        
    }
}


// ====================================================
// =================== LEG LEVER ======================
// ====================================================

module legLever() {
    hull() {
        cylinder(h=2.5,d=6, $fn = 100);
        translate([25,0,0]) cylinder(h=2.5,d=3, $fn = 100);
    }
    translate([0,0,3.3]) cylinder(h=1.6,d=5, center = true,  $fn = 100);
    translate([0,0,9.1]) cylinder(h=10.1,d=3, center = true,  $fn = 4);
}


// ====================================================
// ================= FOREARMS/HANDS ===================
// ====================================================

module hand(){
    difference() {
        sphere(d=8.5);
        cylinder(d=3,h=9,center=true);
    }

    
    translate([7,0,1]) cube([9,4.5,2], center=true);
}

module forearm() {
    cube([8.5,4.5,1.5], center=true);
    translate([4.5,0,-.75])
    union() {
        cube([6,4.5,3], center=true);
        union() {
            translate([3.5,0,0]) difference (){cylinder(d=4.5,h=3,center=true);cylinder(d=1,h=4,center=true);}

            translate([7,-1,0])  difference(){ cylinder(d=4.5,h=3,center=true);cylinder(d=1,h=4,center=true);}
        }
    }
}


module leftHand() {
    union(){
        hand();
        translate([7,0,-.5]) forearm();
    }
}

module rightHand() {
    mirror([0,1,0])leftHand();
}

// ====================================================
// ================== ARM LEVER =======================
// ====================================================

module forearmLever() {
    difference() {
        hull(){
            cylinder(d=4,h=1.5,center=true);
            translate([11,0,0]) cylinder(d=5,h=1.5,center=true);            
        }
        cylinder(d=1,h=2,center=true);
        translate([8,0,0]) hull() {
            cylinder(d=1.5,h=2,center=true);
            translate([2.5,0,0]) cylinder(d=1.5,h=2,center=true);
        }
    }
}


// ====================================================
// ======================= ARM ========================
// ====================================================

module arm(){
    difference() {
        hull() {
            cylinder(h=2.1, d=5.5);
            translate([15,0,0]) cylinder(h=2.1, d=5);
        };
        translate([0,0,-.5]) cylinder(h=2, d=1.5);
        translate([15,0,-.5]) cylinder(h=2, d=1);
        translate([-2,-2,.5]) rotate([0,0,45]) cube([8,10,6]);
        translate([.5,0,-.1]) rotate([0,0,45])cube([10,1,1.3]);
    }

    translate([-7,-2.6,-1.1]) hull() { 
        cylinder(h=2.1, d=2); 
        translate([-.5,0.1,0]) cylinder(h=2.1, d=3);
    }

    translate([-7,0,-1.1])
    difference() {
        hull() {
            translate([0,-2,0]) cylinder(h=2.1, d=2);
            translate([19,0,0]) cylinder(h=2.1, d=5);
        };

    }
}
module leftArm() {
    mirror([0,1,0]) arm();
}
module rightArm() {
    arm();
}

// ====================================================
// ====================== ROBOT =======================
// ====================================================

module bluebot(){
    color("RoyalBlue") {
        translate([10,10,70]) head();
        translate([13.8,20,32]) rotate ([0,0,180]) bodyFront();
        translate([4,0,32])  backBodyBox();
        legs();
        translate([-1,3,29]) rotate([0,-90,180])    legLever();
        
        translate([-1,17,29]) rotate([0,-90,180]) legLever();
        
        translate([36,-8,56.6])  rotate([0,0,180]) rightHand();
        translate([10,-2.8,54]) rotate([0,0,-40])  forearmLever(); 
        
        translate([40,29,56.6])  rotate([0,0,180]) leftHand();  
        translate([13.5,23.5,54]) rotate([0,0,40])  forearmLever();
        
        translate ([10,-3.5,58]) rotate([0,0,-23]) rightArm();
        translate ([10,23,58]) rotate([0,0,23]) leftArm();
        color("yellow") translate([0,10,43]) rotate([0,-90,0]) rearDisk();
    }
    
    translate([15,10,45]) rotate([0,90,0]) 
        frontDisk();
}


bluebot();

  • in reply to javagoza

    Woah, I haven't looked at this in detail, does this include the mechanism inside to move it too?

  • in reply to cstanton

    Not just a solid shell. But I started to give it some movement, even though I didn't finish the script. I'll leave that for the next Spring Clean!

  • in reply to javagoza

    Looks pretty close to the real figure.

    Did you do a 'dubbie' and perform an autopsy ?

    https://community.element14.com/members-area/personalblogs/b/blog/posts/blue-robot-man-electricfied-part-1

    or were you able to get enough measurements with it still intact ?