Hi openSCAD,
for some reason when I remove the highlight '#' in the below macro, the two corresponding cubes simply vanish, instead of being added to the enclosing union. While my design works when I split the difference(), it would be nice to have it in one place, or maybe it is only my system?

$fn=25;
wall=3;
spacer=0.02;
neuH=93;
neuB=121;
oldH=86;
oldB=150;
shiftX=(oldB-neuB)/2;

difference(){
  union(){
    translate([-shiftX+wall,0,0]) { cube([oldB,oldH,wall]); };
    cube([neuB+2wall,neuH+wall,6wall]);
  #  translate([wall+neuB-30,0,0]) { cube([30,20,wall]); };
  #  translate([wall,neuH-17,0]) { cube([34,17,wall]); }; 
  };
  union(){
    translate([wall,-spacer,wall+spacer]) {cube([neuB,neuH+spacer,5wall+spacer]);};
    translate([2wall,4wall-spacer,-wall]) {cube([neuB-2wall,neuH-5wall+spacer,7wall]);};
    translate([0,0,0]) { cube([0,0,0]); };
    translate([-shiftX+oldB-6+wall,oldH-5,-20]) { cylinder(50,1.5,1.5); };
    translate([-shiftX+oldB-5.5+wall,16.2,-20]) { cylinder(50,1.5,1.5); };
    translate([-shiftX+29.8+wall,+5.7,-20]) { cylinder(50,1.5,1.5); };
    translate([-shiftX+6+wall,oldH-5,-20]) { cylinder(50,1.5,1.5); };
    translate([neuB-22.7+wall,12.6,-20]) { cylinder(50,2.35,2.35); };   
    translate([wall+26.5,neuH-9.5,-20]) { cylinder(50,2.35,2.35); };   
    translate([wall+neuB-30-70,2wall,-spacer]) {cube([70,7,wall2]); };
    translate([neuB-20,39,wall+6.2]) { rotate([0,90,0]) { cylinder(50,1.5,1.5); }; };
    translate([-20,21.5,wall+10]) { rotate([0,90,0]) { cylinder(50,1.5,1.5); }; };
    translate([-20,neuH-21.5,wall+10]) { rotate([0,90,0]) { cylinder(50,1.5,1.5); }; };
  };
};

Hadd me stumped for a minute...

The # makes it display that bit, even tho it is removed by the difference,
it is for debugging.

Try

$fn=25;
wall=3;
spacer=0.02;
neuH=93;
neuB=121;
oldH=86;
oldB=150;
shiftX=(oldB-neuB)/2;

difference(){
color("black",0.3) union(){
translate([-shiftX+wall,0,0]) cube([oldB,oldH,wall]); ;
cube([neuB+2wall,neuH+wall,6wall]);

};
color("blue",0.3) union(){
translate([wall,-spacer,wall+spacer])
{cube([neuB,neuH+spacer,5wall+spacer]);};
translate([2wall,4wall-spacer,-wall])
{cube([neuB-2wall,neuH-5wall+spacer,7wall]);};
// translate([0,0,0]) { cube([0,0,0]); };
translate([-shiftX+oldB-6+wall,oldH-5,-20]) { cylinder(50,1.5,1.5); };
translate([-shiftX+oldB-5.5+wall,16.2,-20]) { cylinder(50,1.5,1.5); };
translate([-shiftX+29.8+wall,+5.7,-20]) { cylinder(50,1.5,1.5); };
translate([-shiftX+6+wall,oldH-5,-20]) { cylinder(50,1.5,1.5); };
translate([neuB-22.7+wall,12.6,-20]) { cylinder(50,2.35,2.35); };
translate([wall+26.5,neuH-9.5,-20]) { cylinder(50,2.35,2.35); };
translate([wall+neuB-30-70,2wall,-spacer]) {cube([70,7,wall2]); };
translate([neuB-20,39,wall+6.2]) { rotate([0,90,0]) {
cylinder(50,1.5,1.5); }; };
translate([-20,21.5,wall+10]) { rotate([0,90,0]) { cylinder(50,1.5,1.5);
}; };
translate([-20,neuH-21.5,wall+10]) { rotate([0,90,0]) {
cylinder(50,1.5,1.5); }; };
};
};

translate([wall+neuB-30,0,0]) cube([30,20,wall]); ;
translate([wall,neuH-17,0])  cube([34,17,wall]); ;

That way you add the two extra bits AFTER the cutouts are done.

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Hi!

They don't magically disappear and they are added to the union() but you
subtract them afterwards with
translate([2wall,4wall-spacer,-wall])
{cube([neuB-2wall,neuH-5wall+spacer,7*wall]);};

So you need to either make a more complex subtract shape or add your cubes
outside the difference()...

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