fidget_spinner.scad

// https://www.youtube.com/watch?v=gpeFo8JHxuw&ab_channel=mathcodeprint 

$fn=50;

CENTER_BEARING_SIZE=22;
ARM_DISTANCE=50;
WEIGHT_SIZE=6;
WEIGHT_FACES=6;
NUM_ARMS=3;

for( i=[1:1:NUM_ARMS])
{
 rotate([0,0,i*360/NUM_ARMS]) spinner_arm();
}

module spinner_arm()
{
    difference(){
        difference(){
            difference(){
                hull()
                {   
                    // Center hub
                    cylinder(r=CENTER_BEARING_SIZE/2+5,h=8,center=true);
                    // Shape on End of the arm
                    translate([ARM_DISTANCE,0,0]) cylinder(r=CENTER_BEARING_SIZE/2,h=8,center=true);
                }
                //Material removed for bearing
                cylinder(r=CENTER_BEARING_SIZE/2,h=11,center=true);
                
            }
            //Material removed for apearance
            scale([2,1,1]){
                translate([ARM_DISTANCE/3,ARM_DISTANCE/2,0]) cylinder(r=ARM_DISTANCE/3, h=20, center=true);
                translate([ARM_DISTANCE/3,-ARM_DISTANCE/2,0]) cylinder(r=ARM_DISTANCE/3, h=20, center=true);
                }
        }
        
        //Material removed for weights
        translate([ARM_DISTANCE,0,2]) cylinder(r=WEIGHT_SIZE, h=10, center=true, $fn=WEIGHT_FACES);
        translate([ARM_DISTANCE,0,-1]) cylinder(r=WEIGHT_SIZE/2, h=10, center=true);
    }


}