How to construct a funnel
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Hello,
How can I create a funnel from this geometry, i.e. how can I connect the rectangle to the cylinder?
Kind regards
Alohaa -
@Alohaa something like this?
I added edges for the short slope on the front similar to what you had drawn for the long slope. I also copied out the curves from the cylinderical part and the edges on the top of the rectangular part so I could use Curviloft's Skin Contours tool to create the inner and outer skins. I only did this for one quarter of the thing and then copied and flipped the resulting groups to make the other three. Then I exploded the groups to combine their geometry with the rectangular part and the round part.
I think you'll get cleaner geometry if you set the number of sides for the circles to match the number of sides for the edge of the rectangular part. In this case there are 52 segments around the perimeter of the rectangular shape so 52 sides for the circles.
And, if you're thinking about 3D printing this thing, model it in meters instead of millimeters to avoid the tiny face thing. -
@Dave-R
Hi,
I'm trying to understand your explanations.
A word of explanation: I have a lot of blackberries that I freeze individually (so they don't stick together) on a plate to put them in a bag when they are frozen. I always have to hurry so that they don't start to thaw, and that's when I had the idea of a funnel like this, which I actually want to 3D print. I still have to find out how food-safe PLA is. -
@Alohaa Good idea to use a funnel so you don't thaw the berries with your hands.
Not sure how food safe PLA is. I don't believe it is food safe. Have yo thought about using one of those silicone mats for rolling out dough as a temporary funnel? You could roll it into a funnel shape and pour your berries through that. Use paper clips or masking tape to keep it rolled up.
Not as fun as modeling and 3D printing the funnel but it would be considered food safe, they are easy to clean, and if you've already got a silicone mat you can go pour your berries into bags right now.
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@Dave-R
As the berries do not remain in the funnel but only the outer ones are in contact with the material, and only for a short time, this is probably not so important.There are probably other methods, such as the one you mentioned, but for me it's not just the goal that is the goal, but also the way to get there that appeals to me to design and print such a funnel.
However, I still have my problems with the design: how did you add those edges?
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@Alohaa
I can't manage that.
That's why I drew a new part without rounding.
However, I can't close an area on the inside and I don't know how to connect the circle with the square. -
@Alohaa said in How to construct a funnel:
how did you add those edges?The edges between the rectangular part and the cylindrical part? I just drew a rectangle out from the center of the funnel and then drew the outlines on the face.
You would find it easier to model this thing if you do so centered on the origin.
It's going to be harder to transition from the square corners to the round tube. Since you aren't using Curviloft to create the surfaces, maybe you could replace the round tube with a square one.
I know my suggestion of the silicone mat isn't the same as modeling and 3D printing your funnel but at least you'll know you aren't poisoning the berries with your choice of print media.
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@Dave-R I have replaced the fround tub e by a square one.
I don't manage to close the open surface in the interior. I presume it's open because it has another color than the other ones? -
@Alohaa You can right click on the blue face and the select Reverse Faces to correct that one. You have a lot of internal geometry that needs to be removed. Use a section cut to see it so you can erase it.
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Click in sequence on the scenes tabs of this SU file for ideas.
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@Dave-R Thank you! I am not really familiar with the section function.
@Jean-Lemire: Merci beaucoup! Très intéressant et très instructif! Tu dois bien maîtriser SU! -
@Dave-R PLA it biodegradable and food-safe!
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@Alohaa said in How to construct a funnel:
@Dave-R PLA it biodegradable and food-safe!
I was doing some reading about that. While PLA may be food safe, the dyes used to color it may not be. Several articles I read also indicate that the hot end nozzle may not be food grade and could impart toxins into your prints.
One article for example: https://www.wevolver.com/article/is-pla-food-safe
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