Newbie: How to design a part without voids ?
I sliced up a few of my parts (just to see) and noticed that they are full of
voids decided at printing time (slicer) or when exporting to STL. The
position of these voids are not visible in Openscad.
I now need to make a simple circular part that I will have to drill radially
and tap to receive an M3 screw. How do I know that I will not be drilling
into a void ? In other terms, i there a way to insure that a certain portion
of the part will be voidless ? Can Openscad reveal these voids at design
time ?
Thanks in advance for any help.
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The voids are there because you (or someone/thing else) specified an
infill percentage < 100. I typically use 20% for most parts, because
they are strong enough at 20%, and because it uses less material and
prints more quickly.
As to drill and tap, I include holes in my designs where I need to tap.
The slicers allow you to specify how many "perimeters" to print
(external layers), so a small hole suddenly is surrounded with solid
material, even if the majority of the part only has 20% infill. I would
recommend designing your holes into your part.
Jon
On 12/6/2016 6:26 AM, stressless wrote:
I sliced up a few of my parts (just to see) and noticed that they are full of
voids decided at printing time (slicer) or when exporting to STL. The
position of these voids are not visible in Openscad.
I now need to make a simple circular part that I will have to drill radially
and tap to receive an M3 screw. How do I know that I will not be drilling
into a void ? In other terms, i there a way to insure that a certain portion
of the part will be voidless ? Can Openscad reveal these voids at design
time ?
Thanks in advance for any help.
--
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stressless wrote
I sliced up a few of my parts (just to see) and noticed that they are full
of voids decided at printing time (slicer) or when exporting to STL. The
position of these voids are not visible in Openscad.
I now need to make a simple circular part that I will have to drill
radially and tap to receive an M3 screw. How do I know that I will not be
drilling into a void ? In other terms, i there a way to insure that a
certain portion of the part will be voidless ? Can Openscad reveal these
voids at design time ?
Thanks in advance for any help.
When you say "my parts" do you mean things constructed by OpenSCAD code, or
.STL etc you import() into OpenSCAD?
In the former, you create the voids, in the latter they are there as
designed.
I think the answer is NO, not by default.
One option is to use projection(cut=true)
https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/3D_to_2D_Projection
with a translate in an animation, it will let you see through the model in
slices
I'm not sure what you mean by "full of voids decided at printing time
(slicer) ".
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Thanks Jon. If the infill percentage is to be set on the printer, I cannot do
anything about it because I don't own a printer. I order my parts at a 3rd
party's. If it can be specified within Openscad, please instruct me.
As for the drill and tap, I will follow your advice and design holes into my
parts
Dan
jon_bondy wrote
The voids are there because you (or someone/thing else) specified an
infill percentage < 100. I typically use 20% for most parts, because
they are strong enough at 20%, and because it uses less material and
prints more quickly.
As to drill and tap, I include holes in my designs where I need to tap.
The slicers allow you to specify how many "perimeters" to print
(external layers), so a small hole suddenly is surrounded with solid
material, even if the majority of the part only has 20% infill. I would
recommend designing your holes into your part.
Jon
On 12/6/2016 6:26 AM, stressless wrote:
I sliced up a few of my parts (just to see) and noticed that they are
full of
voids decided at printing time (slicer) or when exporting to STL. The
position of these voids are not visible in Openscad.
I now need to make a simple circular part that I will have to drill
radially
and tap to receive an M3 screw. How do I know that I will not be drilling
into a void ? In other terms, i there a way to insure that a certain
portion
of the part will be voidless ? Can Openscad reveal these voids at design
time ?
Thanks in advance for any help.
--
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http://forum.openscad.org/Newbie-How-to-design-a-part-without-voids-tp19488.html
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Thanks MichaelAtOz,
I actually cut up real printed parts that were designed with Openscad to see
what was "inside". And no, I did not design these voids. When I say "voids",
I mean empty spaces within the parts where no material was deposited. This
probably has to do with the infill factor mentioned by Jon (above message).
When I design parts in Openscad, I just see a solid fully filled piece
(unless I difference() ). When I receive the part from my 3rd party printer,
the part has a large number of non-designed voids in between the outer
walls. That's fine with me because the part is strong enough but it's a
bother if, in my case, I need to drill and tap a hole.
I just wanted to know if it is possible to see and control the number and
position of these voids at design time. They come as a surprise when I
receive the part from my remote printer.
Sorry for not being clear in my first message.
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On Tue, 6 Dec 2016 11:18:35 -0700 (MST)
stressless wintoweb@gmail.com wrote:
Thanks MichaelAtOz,
I actually cut up real printed parts that were designed with Openscad to see
what was "inside". And no, I did not design these voids. When I say "voids",
I mean empty spaces within the parts where no material was deposited. This
probably has to do with the infill factor mentioned by Jon (above message).
When I design parts in Openscad, I just see a solid fully filled piece
(unless I difference() ). When I receive the part from my 3rd party printer,
the part has a large number of non-designed voids in between the outer
walls. That's fine with me because the part is strong enough but it's a
bother if, in my case, I need to drill and tap a hole.
I just wanted to know if it is possible to see and control the number and
position of these voids at design time.
Talk to your printer. If there are voids in your product and not in your
STL then they are adding them (which is normal for a lot of 3D companies,
generally the right thing to do, but a disaster if you are are doing
anything structural).
Alan
Hi Dan
On 06.12.2016 18:56, stressless wrote:
Thanks Jon. If the infill percentage is to be set on the printer, I cannot do
anything about it because I don't own a printer. I order my parts at a 3rd
party's. If it can be specified within Openscad, please instruct me.
What 3rd party especially? You may be able to supply a model describing
the general shape of your model and one describing the areas that need
to be filled 100%. It depends on the sclicer used by the 3rd party and
the effort they want to put into the job.
With kind regards
Stefan Peter
--
There is no system but GNU, and Linux is one of its kernels.
stressless,
It is usual to specify infill and perimeters values when you order a 3D
printing. If you don't they set them to standard values. Talk to them: 20%
is fine for non-structural parts, as jon wrote, and 3 to 4 perimeters is
enough if you will tap some part hole.
Slic3r's Modifier meshes will let you set the infill to 100% selectively,
fyi. I have a pull request open to generate those meshes on the fly and
position them in Slic3r.
--Joseph Lenox
On Tue, Dec 6, 2016 at 12:55 PM, Ronaldo Persiano rcmpersiano@gmail.com
wrote:
stressless,
It is usual to specify infill and perimeters values when you order a 3D
printing. If you don't they set them to standard values. Talk to them: 20%
is fine for non-structural parts, as jon wrote, and 3 to 4 perimeters is
enough if you will tap some part hole.
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Thanks to all for your valuable replies.
I feel a bit smarter now and will put the advice to good use.
Regards,
Dan
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