OpenSCAD source code: Retaining latch for bathroom door

Bathroom Door Retainer.scad

// Bathroom Door Retainer
// Ed Nisley KE4ZNU - May 2017
// 2020-07 beef up, particularly at top of bar

Layout = "Show";			// [Show, Build]

//-------
//- Extrusion parameters must match reality!

/* [Hidden] */

ThreadThick = 0.20;
ThreadWidth = 0.40;

HoleWindage = 0.2;

Protrusion = 0.1; 				// make holes end cleanly

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

//-------
// Dimensions

/* [Dimensions] */

TowelBarSide = 20.5;          // towel bar across flat side
TowelBarAngle = 45;           // rotation of top flat from horizontal
BumpOD = 2.0;                 // retaining ball

DoorOffset = 14.0;            // from towel bar to door
DoorThick = 37.0;

WallThick = 8.0;              // minimum wall thickness
PlateThick = 4.0;             //  ... slab

RetainerDepth = 15.0;         // thickness of retaining notch

NumSides = 6*4;
CornerRad = WallThick;

BarClipOD = TowelBarSide*sqrt(2) + 2*WallThick;
BarClipRad = BarClipOD/2;

OAH = RetainerDepth + PlateThick;

module LatchPlan() {

  union() {
    linear_extrude(height=OAH,convexity=4)
      difference() {
        union() {
          circle(d=BarClipOD,$fn=NumSides);
          hull()
            for (i=[0,1], j=[0,1])
              translate([i*(BarClipRad + DoorOffset + DoorThick + WallThick - CornerRad),j*(BarClipRad - CornerRad)])
                circle(r=CornerRad,$fn=4*4);
        }
        rotate(TowelBarAngle)                           // towel bar shape
          square(size=TowelBarSide,center=true);
        translate([0,-TowelBarSide/sqrt(2)])            // make access slot
          rotate(-TowelBarAngle)
            square(size=[2*TowelBarSide,TowelBarSide],center=false);
      }
    for (a=[0:180:360])
      rotate(a + TowelBarAngle)
        translate([TowelBarSide/2,0,OAH/2])
          rotate([90,0,45])
            sphere(d=BumpOD,$fn=4*3);
  }
}

module Latch() {

  difference() {
    LatchPlan();
    translate([BarClipRad + DoorOffset,-BarClipRad/2,-Protrusion])
      cube([DoorThick,BarClipOD,RetainerDepth + Protrusion],center=false);
  }
}

//-------
// Build it!

if (Layout == "Show") {
  Latch();
}

if (Layout == "Build") {
  translate([0,0,OAH])
  rotate([180,0,0])
    Latch();
}

More details on my blog at https://wp.me/poZKh-9ee