HELP! Knob print for an old Sanyo washer  

RE:

This is the sort of small part that really justifies the use of 3D printing and is not too hard to learn to design.

I don't have the washer but that's an interestingly shaped insert - I assume the part looks something like this:

In which case the following OpenSCAD code creates the shape but I don't know any of the measurements - OpenSCAD is a free download so you can measure the part and edit-in the correct values.  The pointer_angle allows you to change the zero point and will probably need to be a multiple of a right angle.

// Sanyo Knob

// Alter these parameters to fit
cloverleaf_leafrad=1.5;
cloverleaf_containingsquare=7;
cloverleaf_innersquare=6;
cloverleaf_depth=10;
locator_x=1.5;
locator_y=2;

inner_cylinder=12;
outer_cylinder_in=16;
outer_cylinder_out=20;
outer_cylinder_height=28;

knob_dia=40;
knob_thickness=20;
taper=5;
pointer_offset=3;
pointer_angle=0;

overall_thickness=30;
// End of alterable parameters

// set curve accuracy - increase to make smoother
$fn=80;

difference(){
    union(){
        hull(){
            cylinder(d1=knob_dia-taper,d2=knob_dia, h=knob_thickness);
            rotate([0,0,pointer_angle]){
                translate([knob_dia/2+pointer_offset,0,0]){
                    cylinder(d=1,h=knob_thickness);
                }
            }
        }
        cylinder(d=inner_cylinder, h=overall_thickness);
        difference(){
            cylinder(d=outer_cylinder_out,h=outer_cylinder_height);
            cylinder(d=outer_cylinder_in,h=outer_cylinder_height);
        }
    }
    translate([0,0,overall_thickness-cloverleaf_depth]){
        cloverleaf();
    }
}
module cloverleaf(){
  difference(){
        hull(){
            translate([-(cloverleaf_containingsquare/2-cloverleaf_leafrad),-(cloverleaf_containingsquare/2-cloverleaf_leafrad),0]){
                cylinder(r=cloverleaf_leafrad, h=cloverleaf_depth);
            }
              translate([(cloverleaf_containingsquare/2-cloverleaf_leafrad),-(cloverleaf_containingsquare/2-cloverleaf_leafrad),0]){
                cylinder(r=cloverleaf_leafrad, h=cloverleaf_depth);
            }
              translate([-(cloverleaf_containingsquare/2-cloverleaf_leafrad),(cloverleaf_containingsquare/2-cloverleaf_leafrad),0]){
                cylinder(r=cloverleaf_leafrad, h=cloverleaf_depth);
            }
              translate([(cloverleaf_containingsquare/2-cloverleaf_leafrad),(cloverleaf_containingsquare/2-cloverleaf_leafrad),0]){
                cylinder(r=cloverleaf_leafrad, h=cloverleaf_depth);
            }
        }
         translate([-(cloverleaf_innersquare/2+cloverleaf_leafrad),0,0]){
            cylinder(r=cloverleaf_leafrad, h=cloverleaf_depth);
        }
         translate([(cloverleaf_innersquare/2+cloverleaf_leafrad),0,0]){
            cylinder(r=cloverleaf_leafrad, h=cloverleaf_depth);
        }
        translate([0,-(cloverleaf_innersquare/2+cloverleaf_leafrad),0]){
            cylinder(r=cloverleaf_leafrad, h=cloverleaf_depth);
        }
    }
    translate([-locator_x/2,(cloverleaf_innersquare/2),0]){
        cube([locator_x,locator_y,cloverleaf_depth]);
    }
}

 OpenSCAD purists will note that a minkowski would be more elegant and use fewer lines but hull uses considerably less resources...

Cheerio,

RE: HELP! Knob print for an old Sanyo washer

wow you're a life saver thank you so much for this. I've never 3D printed anything tbh, so i was planning on sending it to someone to 3D print it for me, but i  did measure the knob just now

You will need more measurements - work through the parameters in the script and replace the placeholder values until you get an acceptable rendering and then send the resulting .stl file to your printing friend - for a precise fit you may need to trial-print, tweak a few decimal places and iterate a couple of times.  All measurements are in mm except the angle in degrees.

Cheerio,

RE: HELP! Knob print for an old Sanyo washer

thank you so much for you help!