Gas station without pumps

2019 July 17

3D-printed stage jewelry

The 3D slug heart was my first attempt at 3D-printed jewelry, and I’ve only printed it as a draft in green PLA so far.  I wanted to show the director and props people at WEST Performing Arts the possibility of making stage jewelry with a 3D printer, so I designed a simple diamond pendant that can be put on a chain or a cord:

I’ve been playing around a bit with photographing small objects and adding different backgrounds. Here the pendant was photographed on a white background, the background was erased, and a blue backdrop was added.

Here the gold pendant was photographed on a black, textured background, and the background was blurred to make the diamond look shinier.

The diamond itself is a simple piece of OpenSCAD code:

module triangle(side=1)
// equilateral triangle centered at (0,0), with first vertex in +x direction
{   circle(r=side/sqrt(3), $fn=3);
}

module rounded_triangle(side=1)
// intersection of three circles, centers at corners of triangle
{    intersection()
    {   translate([side/sqrt(3),0]) circle(r=side,$fn=60);
        translate([-side/(2*sqrt(3)), side/2])  circle(r=side, $fn=60);
        translate([-side/(2*sqrt(3)), -side/2])  circle(r=side, $fn=60);
   }
}

module beam(side=1, length=3, center=false)
// triangular beam from (0,0,0) to (0,0,length). 
// (0,0,-length/2) to (0,0,length/2) if center is set.
{    linear_extrude(height=length, center=center) triangle(side=side);
}

module rounded_beam(side=1, length=3, center=false)
// rounded_triangle beam from (0,0,0) to (0,0,length). 
// (0,0,-length/2) to (0,0,length/2) if center is set.
{    linear_extrude(height=length, center=center) rounded_triangle(side=side);
}

module chopped_beam(x=13.5, y=27, side=20)
// triangular beam from (x,0,0) to (0,y,0), side-wide,
//  sitting on top of x,y plane and staying in 1st quadrant.
// center line of beam directly above (x,0) to (0.y)
{
    intersection()
    {  cube(abs(x)+abs(y)+side);
        
       translate([x/2, y/2, side/(2*sqrt(3))]) // slide out and raise
        rotate([0,0,atan2(y,-x)])  // beam parallel to (x,0), (y,0)
         rotate([0,-90,0])  // beam along x-axis
          beam(side=side, center=true, 
            length = 2*(abs(x)+abs(y)+side));
     }
 }
  
 module diamond(width=50, height=100, side=20, hole=4)
 {
     length = sqrt( height*height + width*width)/2;
     x = width /2 - (length/height) * side;
     y = height/2 - (length/width)*side;
     difference()
     {    union()
         {   
             chopped_beam(x=x, y=y, side=side);
             mirror([0,1,0]) chopped_beam(x=x, y=y, side=side);
             mirror([1,0,0]) chopped_beam(x=x, y=y, side=side);
             mirror([0,1,0]) mirror([1,0,0]) chopped_beam(x=x, y=y, side=side);
         }
         
         translate([0, y, side/(2*sqrt(3))])
           rotate([0,-90,0]) 
             rounded_beam(side=hole, length=width, center=true);
     }
 }
 
 diamond();

I made a triangular beam, rotated it into position and chopped it down to a single quadrant, then mirrored it to make the diamond. The hole for the cord or chain is made with a rounded triangle rather than a circle, so that there is no flat spot on top to cause drooping of the filament.

I have released this design on Thingiverse: https://www.thingiverse.com/thing:3753904

3 Comments »

  1. […] previously posted about my 3D-printed stage jewelry: the 3D slugs  and the diamond, printed on my Monoprice Delta Mini printer using CC3D Silk Gold PLA […]

    Pingback by 3D-printed chain of office | Gas station without pumps — 2019 July 27 @ 15:29 | Reply

  2. […] previously posted about my 3D-printed stage jewelry: the 3D slugs , the diamond, and the chain of office, printed on my Monoprice Delta Mini printer using CC3D Silk Gold PLA […]

    Pingback by More large pendants | Gas station without pumps — 2019 August 10 @ 10:44 | Reply

  3. […] previously posted about my 3D-printed stage jewelry: the 3D slugs , the diamond, the chain of office, and large pendants printed on my Monoprice Delta Mini printer using CC3D Silk […]

    Pingback by Star-of-stars, another large pendant | Gas station without pumps — 2019 August 11 @ 13:47 | Reply


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