I suspect that a post I made yesterday from my bt.internet address did
not make it to the list. (One acid test I can normally rely on is that
it immediately appears in Empathy, and it didn't.) So I'm posting again
from my gmail address.

I've also now added a photo of the latest covers. Following the advice
on rounding the inside corners, these are now a pleasingly tight fit.
Attached or here:

https://www.dropbox.com/s/oqyf075xhf70mzg/EndCoversSmallWhite-20210730.jpg?raw=1

I printed several covers of various sizes. But I'm now trying to
parameterise the code. I'm baffled why the thickness is not 2mm on all
four sides?

Screenshot attached or here:
https://www.dropbox.com/s/n1nczlc1ksue0fc/PuzzlingError.jpg?raw=1

Current code:

$fn=40;

//Example
Thick = 2;
InnerWidth = 67.8;
InnerHeight = 54.9;
Lip = 8;
Round = 3;
OuterWidth = InnerWidth + 2Thick;
OuterHeight = InnerHeight + 2Thick;

linear_extrude(Lip)

difference() {

 // Apply rounding of Round to both
 // outer and inner squares
 // Before applying offset, reduce
 // dimensions to compensate
 offset (Round) // Applies rounding
 offset(-Round) // Reduces dimensions
 square([OuterWidth, InnerWidth], true);
 // Required inner square has same inner
 // dimensions as exterior of guttering
 // and thickness of 2mm
 // Before applying offset reduce
 // dimensions to compensate
 offset (Round) // Applies rounding
 offset(-Round) // Reduces dimensions
 square([InnerWidth, InnerHeight], true);

}
// Add back cover, 1 larger than inner square
translate([0,0,1])
#cube([InnerWidth+1, InnerHeight+1, Thick], true);

Terry

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I think your first square should be: square([OuterWidth,OuterWidth], true);

On Sat, 31 Jul 2021 at 09:55, Terry terrypingm@gmail.com wrote:

I suspect that a post I made yesterday from my bt.internet address did
not make it to the list. (One acid test I can normally rely on is that
it immediately appears in Empathy, and it didn't.) So I'm posting again
from my gmail address.

I've also now added a photo of the latest covers. Following the advice
on rounding the inside corners, these are now a pleasingly tight fit.
Attached or here:

https://www.dropbox.com/s/oqyf075xhf70mzg/EndCoversSmallWhite-20210730.jpg?raw=1

I printed several covers of various sizes. But I'm now trying to
parameterise the code. I'm baffled why the thickness is not 2mm on all
four sides?

Screenshot attached or here:
https://www.dropbox.com/s/n1nczlc1ksue0fc/PuzzlingError.jpg?raw=1

Current code:

$fn=40;

//Example
Thick = 2;
InnerWidth = 67.8;
InnerHeight = 54.9;
Lip = 8;
Round = 3;
OuterWidth = InnerWidth + 2Thick;
OuterHeight = InnerHeight + 2Thick;

linear_extrude(Lip)

difference() {

// Apply rounding of Round to both
// outer and inner squares
// Before applying offset, reduce
// dimensions to compensate
offset (Round) // Applies rounding
offset(-Round) // Reduces dimensions
square([OuterWidth, InnerWidth], true);
// Required inner square has same inner
// dimensions as exterior of guttering
// and thickness of 2mm
// Before applying offset reduce
// dimensions to compensate
offset (Round) // Applies rounding
offset(-Round) // Reduces dimensions
square([InnerWidth, InnerHeight], true);

}
// Add back cover, 1 larger than inner square
translate([0,0,1])
#cube([InnerWidth+1, InnerHeight+1, Thick], true);

Terry

---

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But I think you meant to type square([OuterWidth,OuterHeight], true);

Hi Terry,

Here's a fishing rod -

//rounded cube etc.

ht = 30;    // height of profile
lno = 40 ;    // length outside
wh = 50;  // width outside
th = 1.5 ;    // wall thickness
rot = 3;  // outside radius
rin = 1.5;    // inside radius

cutt= 20; //height of box to top cut

cutlid =6; //height of lid
cl=0.3; // clearance for lid

 $fn=100;


//profile(lno,wh,ht,th,rot,rin);

// base(cutt,lno,wh,ht,th,rot,rin);
lid(cutlid,lno,wh,ht,th,rot,rin,cl);

////////////////////////////////////////////////////////////////////////////////////////////////////

 module lid(cutl,l,w,h,t,ro,ri,cl){
 cut1=cutl;
 l1=l+cl+t+t;
 w1=w+cl+t+t;
 h1=h+t;
 t1=t;
 ri1=ro+cl;
 ro1=ri1+t;
 base (cut1,l1,w1,h1,t1,ro1,ri1);
   }

 module base(cut,l,w,h,t,ro,ri)   {
     difference(){
        profile(l,w,h,t,ro,ri);
          translate([0,0, h+cut])   cube([3*l,3*w,3*h],true);
        }
 }

 module profile(l,w,h,t,ro,ri){
     li=l-t-t;
     wi=w-t-t;
     hi=h-t-t;
     echo(li,wi);
  difference(){
     rounded(l,w,h,ro);
       rounded(li,wi,hi,ri);
}
}


 module rounded(l,w,h,r){
     x=(l/2)-r;
     y=(w/2)-r;
     z=(h/2)-r;
   hull(){
     translate([x,y,z])sphere(r);
     translate([x,-y,z])sphere(r);
     translate([-x,-y,z])sphere(r);
     translate([-x,y,z])sphere(r);
     translate([x,y,-z])sphere(r);
     translate([x,-y,-z])sphere(r);
     translate([-x,-y,-z])sphere(r);
     translate([-x,y,-z])sphere(r);
   }
 }

// that's it

A generic solution for a box, which rounds all corners, not very fast in
rendering 'cos of the hulls. it will make a box with outside fitted lid,
you can use it as a cap, just set profile values to size of your
trunking, then the cutlid to the depth of the lid/cover that you want.
make ht greater than cutlid of course.  Although it could be made more
parametric, in as much as usually ro=ri*th, sometimes you may need a
sharper inner corner, and are happy with a thinner wall thickness at the
corner. Uncomment/comment the items you want to look at - profile, base,
lid

NB, had some fun using 'ln' instead of 'lno' ;-)

NB2, 'ht' will be the length of your pipe  set 'rot' to corner radius
of pipe, ('rin' to something a bit smaller) and 'cutlid' to height of
your lid, 'cutt' to something bigger than 'cutlid', but less than 'ht',
set 'cl' to allow for printing errors/whatever. I think that is all the
oddities. Your slicer will place it on the build plate.

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To unsubscribe send an email to discuss-leave@lists.openscad.org

I don't like typing and I try to avoid repeating anything.

Hi Terry,

Here's a fishing rod -

//rounded cube etc.

 ht = 30;     // height of profile
  lno = 40 ;    // length outside
  wh = 50;  // width outside
  th = 1.5 ;    // wall thickness
 rot = 3;   // outside radius
 rin = 1.5;    // inside radius

  cutt= 20; //height of box to top cut

  cutlid =6; //height of lid
  cl=0.3; // clearance for lid

   $fn=100;

  //profile(lno,wh,ht,th,rot,rin);
 // base(cutt,lno,wh,ht,th,rot,rin);
  lid(cutlid,lno,wh,ht,th,rot,rin,cl);

////////////////////////////////////////////////////////////////////////////////////////////////////

   module lid(cutl,l,w,h,t,ro,ri,cl){
   cut1=cutl;
   l1=l+cl+t+t;
   w1=w+cl+t+t;
   h1=h+t;
   t1=t;
   ri1=ro+cl;
   ro1=ri1+t;
   base (cut1,l1,w1,h1,t1,ro1,ri1);
     }

   module base(cut,l,w,h,t,ro,ri)   {
       difference(){
          profile(l,w,h,t,ro,ri);
            translate([0,0, h+cut])   cube([3l,3w,3*h],true);
          }
   }

   module profile(l,w,h,t,ro,ri){
       li=l-t-t;
       wi=w-t-t;
       hi=h-t-t;
       echo(li,wi);
    difference(){
       rounded(l,w,h,ro);
         rounded(li,wi,hi,ri);
  }
  }

   module rounded(l,w,h,r){
       x=(l/2)-r;
       y=(w/2)-r;
       z=(h/2)-r;
     hull(){
       translate([x,y,z])sphere(r);
       translate([x,-y,z])sphere(r);
       translate([-x,-y,z])sphere(r);
       translate([-x,y,z])sphere(r);
       translate([x,y,-z])sphere(r);
       translate([x,-y,-z])sphere(r);
       translate([-x,-y,-z])sphere(r);
       translate([-x,y,-z])sphere(r);
     }
   }

// that's it

A generic solution for a box, which rounds all corners, not very fast in
rendering 'cos of the hulls. it will make a box with outside fitted lid,
you can use it as a cap, just set profile values to size of your
trunking, then the cutlid to the depth of the lid/cover that you want.
make ht greater than cutlid of course.  Although it could be made more
parametric, in as much as usually ro=ri*th, sometimes you may need a
sharper inner corner, and are happy with a thinner wall thickness at the
corner. Uncomment/comment the items you want to look at - profile, base, lid

NB, had some fun using 'ln' instead of 'lno' ;-)

NB2, 'ht' will be the length of your pipe   set 'rot' to corner radius
of pipe, ('rin' to something a bit smaller) and 'cutlid' to height of
your lid, 'cutt' to something bigger than 'cutlid', but less than 'ht',
set 'cl' to allow for printing errors/whatever. I think that is all the
oddities. Your slicer will place it on the build plate.

OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org

WARNING: Ignoring unknown variable '3l' in file Ray.scad, line 37
WARNING: Ignoring unknown variable '3w' in file Ray.scad, line 37
WARNING: Unable to convert cube(size=[undef, undef, 154.5], ...)
parameter to a number or a vec3 of numbers in file Ray.scad, line 37

translate([0,0, h+cut])   cube([3l,3w,3*h],true);

Excellent, thanks Ray, I'll have fun with that.

Yeah, I too struggle with that lack of distinction between EYE, ONE and
ELL. Is it the same on a Mac?

An ambiguity of another type that sometimes gets me in trouble is
width/length/height!

BTW, they didn't interfere with preview or rendering so what do these
warnings mean?

WARNING: Ignoring unknown variable '3l' in file Ray.scad, line 37
WARNING: Ignoring unknown variable '3w' in file Ray.scad, line 37
WARNING: Unable to convert cube(size=[undef, undef, 154.5], ...)
parameter to a number or a vec3 of numbers in file Ray.scad, line 37

Terry

====================

On Sat, 31 Jul 2021 12:42:54 +0100, you wrote:

Hi Terry,

Here's a fishing rod -

//rounded cube etc.

 ht = 30;     // height of profile
  lno = 40 ;    // length outside
  wh = 50;  // width outside
  th = 1.5 ;    // wall thickness
 rot = 3;   // outside radius
 rin = 1.5;    // inside radius

  cutt= 20; //height of box to top cut

  cutlid =6; //height of lid
  cl=0.3; // clearance for lid

   $fn=100;

  //profile(lno,wh,ht,th,rot,rin);
 // base(cutt,lno,wh,ht,th,rot,rin);
  lid(cutlid,lno,wh,ht,th,rot,rin,cl);

////////////////////////////////////////////////////////////////////////////////////////////////////

   module lid(cutl,l,w,h,t,ro,ri,cl){
   cut1=cutl;
   l1=l+cl+t+t;
   w1=w+cl+t+t;
   h1=h+t;
   t1=t;
   ri1=ro+cl;
   ro1=ri1+t;
   base (cut1,l1,w1,h1,t1,ro1,ri1);
     }

   module base(cut,l,w,h,t,ro,ri)   {
       difference(){
          profile(l,w,h,t,ro,ri);
            translate([0,0, h+cut])   cube([3l,3w,3*h],true);
          }
   }

   module profile(l,w,h,t,ro,ri){
       li=l-t-t;
       wi=w-t-t;
       hi=h-t-t;
       echo(li,wi);
    difference(){
       rounded(l,w,h,ro);
         rounded(li,wi,hi,ri);
  }
  }

   module rounded(l,w,h,r){
       x=(l/2)-r;
       y=(w/2)-r;
       z=(h/2)-r;
     hull(){
       translate([x,y,z])sphere(r);
       translate([x,-y,z])sphere(r);
       translate([-x,-y,z])sphere(r);
       translate([-x,y,z])sphere(r);
       translate([x,y,-z])sphere(r);
       translate([x,-y,-z])sphere(r);
       translate([-x,-y,-z])sphere(r);
       translate([-x,y,-z])sphere(r);
     }
   }

// that's it

A generic solution for a box, which rounds all corners, not very fast in
rendering 'cos of the hulls. it will make a box with outside fitted lid,
you can use it as a cap, just set profile values to size of your
trunking, then the cutlid to the depth of the lid/cover that you want.
make ht greater than cutlid of course.  Although it could be made more
parametric, in as much as usually ro=ri*th, sometimes you may need a
sharper inner corner, and are happy with a thinner wall thickness at the
corner. Uncomment/comment the items you want to look at - profile, base, lid

NB, had some fun using 'ln' instead of 'lno' ;-)

NB2, 'ht' will be the length of your pipe   set 'rot' to corner radius
of pipe, ('rin' to something a bit smaller) and 'cutlid' to height of
your lid, 'cutt' to something bigger than 'cutlid', but less than 'ht',
set 'cl' to allow for printing errors/whatever. I think that is all the
oddities. Your slicer will place it on the build plate.

---

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A courier font is probably better for distinguishing characters, but
I expect there are better ones now - Verdana seems pretty good.