gistfile1.txt

// 18 dec 2025
// openscad model of fader knob for Rane Empath Mixer
// all sizes in mm
$fn=200;
epsilon=0.02;

fader_length = 20;
fader_height=10;
fader_width=5;
fader_width_at_top =4;


difference(){
fader();
translate([0,0,-3])fader_post();
}

module fader_post(){
post_neck = 3.9;
post_throat = 5.0;
post_width = 1.25;
post_height = 6;
translate([0,0,post_height+3])cube([post_neck,post_width,post_height],center=true);
translate([0,0,post_height/2])cube([post_throat,post_width,post_height],center=true);
// measurements from the post 
// 3.9
// 1.24
// 5.06
// 10 tall at least
}

module fader(fillet=1,fader_height=10,fader_length=20,fader_width=5,fader_width_at_top=4){
translate([0,fader_length/2,0])rotate([90,0,0])linear_extrude(h=fader_length)
union(){
translate([-fader_width_at_top+fillet,10,0])circle(r=fillet);
translate([fader_width_at_top-fillet,10,0])circle(r=fillet);
polygon( points = [
                  [0,0],
                  [fader_width,0],
                  [fader_width_at_top,fader_height],
                  [fader_width_at_top-fillet,fader_height],
                  [fader_width_at_top-fillet,fader_height+fillet],
                  [0,fader_height+fillet],
                  [-fader_width_at_top+fillet,fader_height+fillet],
                  [-fader_width_at_top,fader_height],
                  [-fader_width,0]
                  ]);
  }
}