On 13/12/2021 09:38, Jose H wrote:
@Raymond West.
Thank you, I thought about that, but I wanted something that warranted
specific points in order to make it super clean and controlled when I
do boolean logic in 3D so no broken faces and so on.
I had problems in the past with 3d boolean logic and wanted to be
extra careful in 2d although your solution probably works very well.
Now that I have so many alternatives I will test them all and compare
and use the cleanest.
In the physical world, it is the same. You can not make a hole go
through a part when the depth of hole is exactly the same as the
thickness of the part. It is exactly the same in the 'theoretical world'
of openscad. You have to punch holes/whatever further than you think is
necessary, if going right through a part - see below.
Also, if you're printing a plastic tube to fit tightly over a metal
part, you will need to include tolerance values or similar, which may
vary depending on the plastic used and other factors, and I don't think
I'd have sharp angles, I'd round off the corners a bit (inside of the 90
deg bend in your example).
$fn=80;
difference(){ // gives 'z fighting', not pretty
cylinder (20,8,8,true);
cylinder (20,5,5,true);
}
translate ([20,0,0])
difference(){ // perfection personified !
cylinder (20,8,8,true);
translate([0,0,-5])
cylinder (40,5,5,true);
}
Best wishes,
Ray
On 13/12/2021 09:38, Jose H wrote:
> @Raymond West.
> Thank you, I thought about that, but I wanted something that warranted
> specific points in order to make it super clean and controlled when I
> do boolean logic in 3D so no broken faces and so on.
> I had problems in the past with 3d boolean logic and wanted to be
> extra careful in 2d although your solution probably works very well.
>
> Now that I have so many alternatives I will test them all and compare
> and use the cleanest.
>
In the physical world, it is the same. You can not make a hole go
through a part when the depth of hole is exactly the same as the
thickness of the part. It is exactly the same in the 'theoretical world'
of openscad. You have to punch holes/whatever further than you think is
necessary, if going right through a part - see below.
Also, if you're printing a plastic tube to fit tightly over a metal
part, you will need to include tolerance values or similar, which may
vary depending on the plastic used and other factors, and I don't think
I'd have sharp angles, I'd round off the corners a bit (inside of the 90
deg bend in your example).
$fn=80;
difference(){ // gives 'z fighting', not pretty
cylinder (20,8,8,true);
cylinder (20,5,5,true);
}
translate ([20,0,0])
difference(){ // perfection personified !
cylinder (20,8,8,true);
translate([0,0,-5])
cylinder (40,5,5,true);
}
Best wishes,
Ray
