Weird render glitch

[CAPSBOY]

I have a VESA mount SCAD file that the screw holes on one side render fine but the other side is a glitchy mess

[MichaelAtOz]

@CAPSBOY perhaps something like this?

[CAPSBOY]

thats the one ... thank you so much ill have a look and see if its fixed

[CAPSBOY]

{
cube([plate_square_side,plate_square_side,plate_thickness],
center=true);
holes();
}
reading the fix the code is like this and every time I edit it it wont render

[MichaelAtOz]

@CAPSBOY Either you are not providing all the details or they are not making it to the final post.

Reading between the lines, you need holes() to be a small amount below the cube, and to extend a small amount above the cube. So it is basically pushing through both the top & bottom of the cube.

tiny=0.025;
size=10;
// using center makes it easy, no need to translate
difference() {
  cube([size,size,size],center=true);
    cylinder(h=size+2*tiny,r=size/3,center=true);
}

// or
translate([size*2,0,0])
  difference() {
    cube([size,size,size]);
    translate([size/2,size/2,-tiny])  // drop below bottom of cube
      cylinder(h=size+2*tiny,r=size/3); // extend above top of cube
  }

[CAPSBOY]

$fn=20;

ball_dia = 25;
cyl_dia = 11;
cyl_height = 12;
correction=2;
plate_thickness = 6;
plate_countersink_dia = 10;
plate_countersink_depth = 3;
plate_square_side = 85;
screw_dia=4;

// Given that we're rotating 45 degrees and that also helpfully
// is the "deepest" part of our rotation, we can calculate the
// ratio of the hypotenuse to the distance to a side of the square
// to find where the distance to our holes pattern.
ratio = (
sqrt(
(pow((plate_square_side/2),2))
+(pow((plate_square_side/2),2))
)
/(plate_square_side/2));

mount_spacing = (75/2)*ratio;

start_tube = (ball_dia/2)-correction;

sphere(d=ball_dia);

translate([0,0,start_tube]){
cylinder(d=cyl_dia,h=cyl_height+correction);
}

translate([0,0,start_tube
+cyl_height
+correction
+plate_thickness
-(plate_thickness/2)]
) {
plate();
}

module holes()
{
for(a = [45:90:405])
{
rotate(a) {
translate([mount_spacing,0,-plate_thickness/2]) {
cylinder(d=screw_dia, h=plate_thickness*2);
cylinder(d=plate_countersink_dia,h=plate_countersink_depth);
}
}
}
}

module plate()
{
difference()
{
cube([plate_square_side,plate_square_side,plate_thickness],
center=true);
holes();
}
}

Here is the code in full
funny your right two of the same parts are glitched, ive tried to add that code and it renders weird.
cheers

[MichaelAtOz]

When posting code use the <> icon above, or use three backticks (```) on a line before & after the code.

Here I moved the two cylinders down by 1, and made them longer by 1.
So they break through the surface of the plate.

module holes()
{
  for(a = [45:90:405])
  {
    rotate(a) {
      translate([mount_spacing,0,-plate_thickness/2-1]) {
        cylinder(d=screw_dia, h=plate_thickness*2+1);
        cylinder(d=plate_countersink_dia,h=plate_countersink_depth+1);
      }
    }
  }
}

[MichaelAtOz]

When posting code use the <> icon above,

As in 'above' in the GitHub edit box.
If you are emailing, indent the code and use courier/mono spaced font.

[MichaelAtOz]

I think this is done. @t-paul should I remove the feedback label on closing?

[t-paul]

I removed it now, but usually it does not matter much as in most searches the closed are excluded anyway.