Object won't print and is giving me WARNING: Object may not be a valid 2-manifold and may need repair! What's wrong?

classic Classic list List threaded Threaded
11 messages Options
Reply | Threaded
Open this post in threaded view
|

Object won't print and is giving me WARNING: Object may not be a valid 2-manifold and may need repair! What's wrong?

drewa1
Here is my code for a honeycomb cell:
module hexagon(h,s,t,x){
    difference(){
    linear_extrude (height = h, center = false) circle (s, $fn=6, center =
true);
    linear_extrude (height = h+1, center = false) translate ([0,0,-1])
circle (s-t, $fn=6, center = true);
     }

   
}

module honeycomb (h,s,t,x){
    hexagon(h,s,t,x);
       
     outsidenodes=[
    /*0*/[s,0,h+x],
    /*1*/[s,0,h],
    /*2*/[s/2,(s*sqrt(3))/2,h],
    /*3*/[-s/2,(s*sqrt(3))/2,h],
    /*4*/[-s/2,(s*sqrt(3))/2,h+x],
    /*5*/[-s,0,h],
    /*6*/[-s/2,-(s*sqrt(3))/2,h],
    /*7*/[-s/2,-(s*sqrt(3))/2,h+x],
    /*8*/[s/2,-(s*sqrt(3))/2,h],
    /*9*/[0,0,h+2*x]
];
    outsideface=[
    [1,0,9,2],
    [8,9,0,1],
    [6,7,9,8],
    [5,9,7,6],
    [3,4,9,5],
    [2,9,4,3]
    ];
   
   
union(){
    polyhedron (outsidenodes, outsideface) hexagon(h,s,t,x);
}

union(){
    scale ([1-(2*t)/(2*s),1-(2*t)/(2*s),1]) polyhedron (outsidenodes,
outsideface);
}
}

honeycomb(10,5,1,(5*sqrt(2))/4);

And here is the console output:
Compiling design (CSG Tree generation)...
Rendering Polygon Mesh using CGAL...
PolySet has nonplanar faces. Attempting alternate construction
PolySet has nonplanar faces. Attempting alternate construction
Geometries in cache: 9
Geometry cache size in bytes: 6624
CGAL Polyhedrons in cache: 4
CGAL cache size in bytes: 186912
Total rendering time: 0 hours, 0 minutes, 4 seconds
   Top level object is a 3D object:
   Simple:         no
   Vertices:       33
   Halfedges:     128
   Edges:          64
   Halffacets:     66
   Facets:         33
   Volumes:         2
WARNING: Object may not be a valid 2-manifold and may need repair!
Rendering finished.

I am relatively new to this, so any input is appreciated.  I am probably
missing something pretty basic.  How can I merge a polyhedron to an object
created with linear_extrude.  Is it something wrong with the polyhedron
itself?

Thanks in advance.



--
Sent from: http://forum.openscad.org/

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
Reply | Threaded
Open this post in threaded view
|

Re: Object won't print and is giving me WARNING: Object may not be a valid 2-manifold and may need repair! What's wrong?

MichaelAtOz
Administrator
drewa1 wrote
> Is it something wrong with the polyhedron
> itself?

Yeo, comment out the hexagon call, leaving your polyhedron.
F5 then View/Thrown-together, see the purple. Read  this
<https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Primitive_Solids#Mis-ordered_faces>
.

Also note that those union() calls are not needed there. it is ued with
multible sub-objects inside the {}.
There is an implicit union of all objects in a module or main program.




-----
Admin - PM me if you need anything, or if I've done something stupid...

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.

The TPP is no simple “trade agreement.”   Fight it! http://www.ourfairdeal.org/   time is running out!
--
Sent from: http://forum.openscad.org/

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
Admin - email* me if you need anything,
or if I've done something stupid...
* click on my MichaelAtOz label, there is a link to email me.

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work.
Obviously inclusion of works of previous authors is not included in the above.


The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out!
Reply | Threaded
Open this post in threaded view
|

Re: Object won't print and is giving me WARNING: Object may not be a valid 2-manifold and may need repair! What's wrong?

MichaelAtOz
Administrator
That was meant to be YEP,



-----
Admin - PM me if you need anything, or if I've done something stupid...

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.

The TPP is no simple “trade agreement.”   Fight it! http://www.ourfairdeal.org/   time is running out!
--
Sent from: http://forum.openscad.org/

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
Admin - email* me if you need anything,
or if I've done something stupid...
* click on my MichaelAtOz label, there is a link to email me.

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work.
Obviously inclusion of works of previous authors is not included in the above.


The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out!
Reply | Threaded
Open this post in threaded view
|

Re: Object won't print and is giving me WARNING: Object may not be a valid 2-manifold and may need repair! What's wrong?

MichaelAtOz
Administrator
In reply to this post by drewa1
Also, you can't build an object that way with two poly's, you need to make it
enclosed (manifold - waterproof, no purple on the outside), so if you closed
off the bottom, then you could, for example, difference() a smaller one from
a larger one to make the hollow inside.



-----
Admin - PM me if you need anything, or if I've done something stupid...

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.

The TPP is no simple “trade agreement.”   Fight it! http://www.ourfairdeal.org/   time is running out!
--
Sent from: http://forum.openscad.org/

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
Admin - email* me if you need anything,
or if I've done something stupid...
* click on my MichaelAtOz label, there is a link to email me.

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work.
Obviously inclusion of works of previous authors is not included in the above.


The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out!
Reply | Threaded
Open this post in threaded view
|

Re: Object won't print and is giving me WARNING: Object may not be a valid 2-manifold and may need repair! What's wrong?

drewa1
In reply to this post by MichaelAtOz
How do I fix this, no matter what orientation I put a face in, it says
misordered.  Also, is this not clockwise orientation? Will the print work if
the face is ordered correctly?



--
Sent from: http://forum.openscad.org/

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
Reply | Threaded
Open this post in threaded view
|

Re: Object won't print and is giving me WARNING: Object may not be a valid 2-manifold and may need repair! What's wrong?

drewa1
In reply to this post by MichaelAtOz
What do you mean by this? Which part needs to be closed off? Separate the two
polyhedrons?



--
Sent from: http://forum.openscad.org/

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
Reply | Threaded
Open this post in threaded view
|

Re: Object won't print and is giving me WARNING: Object may not be a valid 2-manifold and may need repair! What's wrong?

MichaelAtOz
Administrator
<http://forum.openscad.org/file/t359/open_bottom_poly.jpg>

This is one poly upside-down, note it has not got a bottom, just the top
shell.
In this case the faces are pointing outside but you see the inside purple
faces thru this hole.
It is not a valid 3D object.
If you put a face(s) on the bottom, that will cover the  hole and make it a
3D object.

Think of a cube() and what it would be like if you removed one face.

Then you can sale the 3D object smaller, and difference this from the
original, you will get a proper 3D object.



-----
Admin - PM me if you need anything, or if I've done something stupid...

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.

The TPP is no simple “trade agreement.”   Fight it! http://www.ourfairdeal.org/   time is running out!
--
Sent from: http://forum.openscad.org/

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
Admin - email* me if you need anything,
or if I've done something stupid...
* click on my MichaelAtOz label, there is a link to email me.

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work.
Obviously inclusion of works of previous authors is not included in the above.


The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out!
Reply | Threaded
Open this post in threaded view
|

Re: Object won't print and is giving me WARNING: Object may not be a valid 2-manifold and may need repair! What's wrong?

MichaelAtOz
Administrator
In reply to this post by drewa1
Alternatively, if you want one object, you could add points to the poly to
build 'thickness' to the walls, conceptually like the triangular hole on the
poly in that wiki link.



-----
Admin - PM me if you need anything, or if I've done something stupid...

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.

The TPP is no simple “trade agreement.”   Fight it! http://www.ourfairdeal.org/   time is running out!
--
Sent from: http://forum.openscad.org/

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
Admin - email* me if you need anything,
or if I've done something stupid...
* click on my MichaelAtOz label, there is a link to email me.

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work.
Obviously inclusion of works of previous authors is not included in the above.


The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out!
Reply | Threaded
Open this post in threaded view
|

Re: Object won't print and is giving me WARNING: Object may not be a valid 2-manifold and may need repair! What's wrong?

MichaelAtOz
Administrator
In reply to this post by drewa1
Try this:

difference() {
  cube(50,true);
  translate([0,0,10.01])
    cube(30,true);
}

Compare how this has thickness and faces on the inside of the hole, building
an enclosed 3D object.
All the purple is inside that thickness.

That is what your shape needs to be like.



-----
Admin - PM me if you need anything, or if I've done something stupid...

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.

The TPP is no simple “trade agreement.”   Fight it! http://www.ourfairdeal.org/   time is running out!
--
Sent from: http://forum.openscad.org/

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
Admin - email* me if you need anything,
or if I've done something stupid...
* click on my MichaelAtOz label, there is a link to email me.

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work.
Obviously inclusion of works of previous authors is not included in the above.


The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out!
Reply | Threaded
Open this post in threaded view
|

Re: Object won't print and is giving me WARNING: Object may not be a valid 2-manifold and may need repair! What's wrong?

MichaelAtOz
Administrator
This may help
https://www.3dcreationlab.co.uk/tutorials/top-5-considerations-when-designing-for-3d-printing.php 



-----
Admin - PM me if you need anything, or if I've done something stupid...

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.

The TPP is no simple “trade agreement.”   Fight it! http://www.ourfairdeal.org/   time is running out!
--
Sent from: http://forum.openscad.org/

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
Admin - email* me if you need anything,
or if I've done something stupid...
* click on my MichaelAtOz label, there is a link to email me.

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work.
Obviously inclusion of works of previous authors is not included in the above.


The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out!
Reply | Threaded
Open this post in threaded view
|

Re: Object won't print and is giving me WARNING: Object may not be a valid 2-manifold and may need repair! What's wrong?

Ronaldo
In reply to this post by drewa1
​I don't know how you want your hexagon cap but that is an alternative:

difference() {
    hull() polyhedron (outsidenodes, outsideface);
    translate([0,0,-0.0001])
      scale ([1-(2*t)/(2*s),1-(2*t)/(2*s),1]) 
        hull() polyhedron (outsidenodes, outsideface);
}​


2018-05-22 4:18 GMT+01:00 drewa1 <[hidden email]>:
How do I fix this, no matter what orientation I put a face in, it says
misordered.  Also, is this not clockwise orientation? Will the print work if
the face is ordered correctly?



--
Sent from: http://forum.openscad.org/

_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org


_______________________________________________
OpenSCAD mailing list
[hidden email]
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org