0304 Blender Mesh repair for Booleans and Print Video Lecture | Learn 3D Modelling: The Ultimate Blender Guide - Software Development

so I made billions look really easy
because I didn't really do much with
them but bullion's can be a big pain in
the butt sometimes and I'll show you why
so I'm going to take these and shifty
them and I'm going to take this and knob
maybe take a face and choose to flip the
normal on it so I'm just going to flip
the direction of this now I wouldn't be
able to see this unless I hit n on the
keyboard and then go down to display and
show back face culling so now you can
see that this is clear at the bottom
it's it's not clear all right now I'll
take one of these and I'll show you how
to separate these so if you click on one
hit l you can go mesh vertices separate
selection or PM a keyboard now you can
grab that single one and go object
transform origin to geometry that just
centers that origin up
seven on a number pad just going to put
it in line with that and let's say I
wanted to cut a hole in the middle of
this weird mesh with the normal and
flipped on the other side so let's do
that so this is still called button
while I do believe this is called
buttonholes point zero zero one so I'm
just going to grab this mesh and do a
boolean with it bulleen i'll choose
difference and i'll use buttonholes
zeros or one whoa I'll hit apply just to
show you what happens okay check that
out and that weird so instead of a hole
it made a hole on one side and then on
the other side it made this inverted peg
so that's what happened you got to
really watch your normals what direction
they're in and if they're in the wrong
direction it's going to have some really
funky results so that's one thing that
happens all the time in that and how you
fix that is you just make sure you flip
the normal before you go to do the
boolean operation if you see strange
results just don't apply it to the model
and you'll be all right okay one last
thing so by doing a boolean operation
you could cause some damage to the mesh
and it could have some strange results
on 3d printing so you have to run it
through a service in order to repair it
now there's two different ways to do
this you could go download a program
called net fab studio in the fab studio
that's a awesome program and it has a
very basic version in fact as a student
I want you to go download that put it on
your computer and you can see it pops up
with this until you buy the program you
have to wait like so many seconds and
then i can hit later
now this is for educational purposes
only you know I adil I'm going to be
purchasing this right off the bat but
later on down the road we can explore
maybe getting a whole lab of this but
for right now let's use the basics
projects open let's go to desktop and
choose button and hit open you see this
! it's already telling me that there's a
problem with the mesh but if you click
on it with the left mouse go to the
little repair icon you'll see that these
little red lines those are what the
problem is these are called these are
back faced or there's another one
there's another term to it too but let's
just say it's one face laying on top of
the other face perfectly in the same
plane to get rid of that you can get to
automatic repair and hit execute and
then apply repair and hit yes it doesn't
look like it did much but it did repair
that now if you right-click you can
export part as still and you can put it
right over the top of button I'm just
going to put it down here and say button
fixed it'll pop up with this it's saying
hey you have some other stuff do you
want to repair that so its really user
friendly comes in handy it's like a
last-ditch effort to help you so you can
hit repair and export so I might have
missed something it program catches it
there's another way to do this well two
different ways you can do this so let's
look at both
okay type in net tab in google and you
can go to net fab com you can go to
services and say net fab cloud services
so another this is a free variation of
it get brows brows it out to button
fixed or button because this one's not
fixed this you have to have a valid
email address that you can check so go
go use millimeters and accept so if you
go check your email and I'm not going to
do that via video because I don't want
to display my email but you'll find that
there's a download for that the last one
that you can do to kind of repair this
sometimes you can go like this go to
vertex go to Z grab all the vertices
it's z again and zoom in on an area
that's highly dense in vertices and go
like this remove doubles now sometimes
it'll say your 10 vertices removed and
you can bump this up just a little bit
but the minute that it starts to get to
the point where you lose some kind of
resolution on the mesh let's say that
instead of these being round it starts
getting octagonal okay you don't want
that like that so you want to do it
within reason and you don't want to lose
a whole lot of detail so make sure that
if you do do that option that you
haven't lost anything but that's a good
way to get rid of degenerate vertices
and everything else now if you ran that
through net fab it should be okay
but that's another way to do it all
right so there's a few ways to repair
meshes i would highly suggest net fab
studio over anything and watch those
flipped normals all right now go print
your button enjoy and then come back
we'll look at the results