0102 Blender things not to do for 3D Printing on component side Copy Video Lecture | Learn 3D Modelling: The Ultimate Blender Guide - Software Development

okay so now we have to talk about
surface I'm going to get rid of this box
and add mesh plane so this surface right
here is facing in one direction if we
hit tab on the keyboard and then hit n
on the keyboard
and go in to face normals and then
choose to display a larger face interval
you can see this blue line up here this
is the direction at which the face is
facing we can also turn on this and I
keep this on all the time try to anyway
call back face culling if I was to flip
this around I would see that that the
face does not is not visible on one side
and it is visible on this side
therefore it's dictating that this is my
frontal face and this is my back face
now important this will never show up in
a 3d print because it is a single
surface not a volume okay so a volume is
this this cube is a volume and if I went
to components I could see that the face
normals are all facing out so this would
show up now if I went to hit R on the
keyboard and then scaled this past a
certain point the face normals will face
in and this will not print the same
thing goes to here if I went to go into
the face click on it and hit ctrl e I
could extrude it now when I extruded it
I could extruded this way or this way
but at least with back face culling I
can tell the difference between the two
now in some cases you can fix this by
hitting tab and then L and then go in
here and I could say maybe flip
direction and that will flip them out
and now it's legit but let's say I had
two or three of these that were flipped
inside and some outside this is totally
on it's wholly not legit these will air
out every time any time I have a mesh
that has surfaces that are pointing in
multiple different directions you can
fix this by going sometimes into L on
the keyboard to highlight it all the
components at once and hit recalculate
in most cases it'll fix it but let's say
it's past Redemption let's add something
a little bit more complex like a UV
sphere and I went randomly in and said
well you know these faces right here
they're going to be flipped and let's
say the whole entire top shell is
flipped and these are flipped at some
point if sales so I can hit recalculate
it worked out well but if it was past
50% of the actual outside surface it
will not recalculate so 50% of the
surface would be something like this now
that's past 50% so in this case if I hit
L it should have some errors see
and that this piece would be almost
impossible to fix because I would have
to generally go in and highlight each
one of these that need to be repaired
and then flip them or at least 50% of
them
like that okay and that stuff that's not
in the blender books all right now
another thing that you can't do surface
wise is this let me get rid of
everything add mesh plain anytime I have
a face and if I go into the component
let's say this vertice and then I pull
it past the surface like this this is a
non mal deformed geometry okay
or a MOT non mal deform to face in what
happens is it has an error every time
some programs can fix it but generally
stay away from doing it so a volume
cannot print this one has an error many
surface normals that are facing in
different directions have errors if you
want something thin here's another tip
so this will never print because it's
not a volume but if you wanted something
that prints that's thin you can hit
anunnaki board and go in and dictate the
size these are in millimeters and if I
put point three here that's really thin
now it doesn't look thin here but this
is two millimeters by two millimeters by
0.3 millimeters so that's really
freaking thin right there and later on
we'll get into nozzle sizes compared to
layer height but that's a little much to
digest right now just no thin stuff make
it thin here all right so hopefully
that's everything that you should not do
nominal form geometry bad surface
Direction multiple different directions
bad thin does not print if it's not a
volume volume not a volume
all right that's everything
component-wise let's look at everything
object wise