OpenSCAD source code: Spacer for a slightly misaligned Farberware kitchen blender

Blender base spacer.scad

// Kitchen blender base adapter
// Ed Nisley KE4ZNU June 2019

//- Extrusion parameters must match reality!

/* [Hidden] */

ThreadThick = 0.25;
ThreadWidth = 0.40;

HoleWindage = 0.2;

Protrusion = 0.1;     // make holes end cleanly

inch = 25.4;

function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit);

ID = 0;
OD = 1;
LENGTH = 2;

//----------
// Just build it

Spacer = [48.0,66.0,1.8];                             // LENGTH raises blade holder
Aligner = [Spacer[ID],52.0,Spacer[LENGTH] + 3.0];     // LENGTH locks into base ring

NumSides = 4*3*4;

//----------
// Just build it

difference() {
  union() {
    cylinder(d=Spacer[OD],h=IntegerMultiple(Spacer[LENGTH],ThreadThick),$fn=NumSides);
    cylinder(d=Aligner[OD],h=Aligner[LENGTH],$fn=NumSides);
  }
  translate([0,0,-Protrusion])
    cylinder(d=Spacer[ID],h=10*Aligner[LENGTH],$fn=NumSides);
}

More details on my blog at https://wp.me/poZKh-8ex