IKEA Skarsta crank shim

skarsta_crank_shim.scad

// IKEA Skarsta crank shim
$fn=100;

fi_in=8;
fi_out=15;
height=8;
fi_screw=4;

difference(){
    difference(){
        cylinder(h=height, d=fi_out, center=true);    
        cylinder(h=height+2,d=fi_in, center=true);
    };
    union(){
        rotate([90,0,0]){
            cylinder(h=fi_out-fi_in+2, d=fi_screw+0.6);
        };
        rotate([0,90,0]){
            cylinder(h=fi_out+2, d=fi_screw+0.6);
        };
    };
};