3D Printed Tri-Wing Bit

Disclaimer. I already knew this probably wouldn’t work.

I had a need to undo some Tri-Wing head screws. I did not have one of these bits and I wondered – perhaps I could 3D-Print one. It wouldn’t have to last forever – in fact if it only worked for 1 screw, that would be enough.

It was a fun little challenge to CAD this in OpenSCAD. (I didn’t find any good models online)

c_h = 3;        //Cone Height
c_d = 3.5;      //Cone Diameter
r_w = 1;        //Rung Width
s_l = 12;       //Stand off Distance
s_d = c_d+1;    //Stand off diameter
h_d = 7;        //Hex Diam
h_h = 15;       //Hex Height

cylinder(h=h_h, d = h_d, $fn = 6);
translate([0,0,h_h])
cylinder(h=s_l, d = s_d, $fn = 6);
translate([0,0,h_h+s_l])
intersection()
{
cylinder(h = c_h, d1 = c_d, d2 = 1, $fn=50);
union()
    {
    translate([0,-r_w/2,0])
        cube([c_d, r_w, c_h]);
    rotate([0,0,120])
        translate([0,-r_w/2,0])
            cube([c_d, r_w, c_h]);
    rotate([0,0,240])
        translate([0,-r_w/2,0])
            cube([c_d, r_w, c_h]);
    }
}

I printed it off in what I thought to be the best orientation (it’s long side on the build plate)

It didn’t work.