$fn=64;

//outside
diameter=15.2+0.7;
diameterBig=17+0.7;
pushFitRadius=1;

//to motor
shaftDiameter=7+0.4;
shaftLength=13;
shaftLowerDiameter=12;
shaftLowerLength=3;
screwDiameter=2.7;
screwDiameterLoose=3.2;
screwPosition=8;

module pushFit() {
    union() {
    cylinder(h=35, r=diameter/2);

    union() {
    for (i=[0:360/6:360]) {
        rotate([0,0,i]) translate([diameterBig/2-pushFitRadius,0,0]) rotate([0,-1.5,0]) cylinder(h=35, r=pushFitRadius);
    }
    }
    }
}

module pushFit2() {
    union() {
        cylinder(h=35, r=diameter/2);

        union() {
            for (i=[0:360/6:360]) {
                rotate([0,0,i]) translate([diameterBig/2-pushFitRadius,0,0]) rotate([0,-0.7,45]) cube([pushFitRadius,pushFitRadius,35]);
            }
        }
        
        translate([0,0,1]) cylinder(h=1, d1=19, d2=diameter);
        cylinder(h=1, d=19);
    }
}

module toMotor() {
    union() {
    cylinder(h=shaftLowerLength, r=shaftLowerDiameter/2);
    translate([0,0,shaftLowerLength-0.01]) cylinder(h=shaftLength, r=shaftDiameter/2);
    translate([0,0,screwPosition]) rotate([90,0,0]) cylinder(h=10,r=screwDiameter/2); //screw hole
    translate([0,0,screwPosition]) rotate([-90,0,0]) cylinder(h=10,r=screwDiameterLoose/2); //screw hole big
    }
}


difference() {
    pushFit2();
    translate([0,0,-0.1]) toMotor();
}