I'm not sure, but I would says it depend on the type of charge and where it is applied. But, generally I would say the infill, since the geometry can greatly affect how the charge is spread.
That depends on the applied load. For crush restistance, infill, no questions asked. For bending, shell thickness will impact the strengh of short thick parts (where bending tension is the problem) while infill will help strengh for long skinny parts like wings (where buckling is the problem). For tensile strengh, printing orientation has the highest impact and infill to shell ratio has no influence since the only really relevant parameter is cross section. The designer now has to figure out how the part will be loaded and apply the necessary print settings.
I find the easiest example to understand is a solid rod vs a hollow pipe. If supported at both ends with a weight suspended in the center, the top is experiencing compression force, the bottom is experiencing tension force, and the forces balance to zero at the center. Thus, the hollow pipe is nearly as strong as the solid rod. The closer you get to the center, the less effect additional material will have.
When making full density prints, I've had better success with shell all the way to the core as opposed to 100 percent infill. Especially with tpu. It's typically a zero interference pattern, leaving less chances for things to go wrong. Full shell is also more forgiving for flow regulation.
What if you put multiple shells within the part with infill between them? Also, what if you could warp/distort the infill itself to better match the contours of the shell?
You would be better off putting the extra material on the outside. Imagine a square rod, sticking out of a table it's attached to. You want to hang something on that rod. In order for the rod to bend down, the top of the rod has to get longer or the bottom of the rod get shorter. For there to be a bend, a curve, the inside radius would have to be smaller than the outside radius. In the center of that rod, the center just has to bend - it doesn't have to get longer or shorter. Which is easier - stretching plastic to make it longer, or bending it? The center will bend easily. The strength comes from the fact that the top won't stretch, so the entire part can't bend. The part infill plays in this is just ensuring that the top doesn't collapse down to hit the bottom, that the rod doesn't crease. This can be seen easily in the construction of cardboard , such as used for a moving box. There are two sheets of paper which makes up the two sides of the cardboard. The paper doesn't stretch, so the cardboard doesn't bend easily. Between the two sheets of paper is just a little wiggly paper (infill) that is only there to maintain some spacing between the top and bottom sheets of paper, the shell.
In strictly shells vs walls, walls would make the stronger print. In saying that,to me the strength of the part of determined by the shape of the part and the percentages of infill vs shell that could be optimized to give it better strength depending on the type of load against the part, weather it’s shock load or tensile strength and even then you could go down a very deep rabbit hole as to what shapes (geometric vs organic). Everything can be optimized now days and there are some good videos out there showing part strength with different loads and different material.
Simple physics. It's the shell thickness which makes the part rigid. You want to add enough shells and just so much infill that it'll be sufficient to create good top layers (shells).
What a lot of us would like to know is when printing Lithophanes, which gives a better finished product. Higher such as 99 to 100% Infill or a Higher Number of Walls such as 20 to 99? There is a Lot of Confusing numbers being put out on Social Media.
7 minutes of 5 guys trying to discuss part strength eh? Simple example: Egg vs cylinder vs bee hive vs topology optimization Anything round will be strong especially from the top and bottom plane of a cylinder and has decent strength from the sides, but mostly when forces act from the inside out. Otherwise, a tubular infill adds little support perpendicular to the circular planes. Honey comb is one of those things in nature, that has great strength, load dispersion and use of space in all orientations. Anything round leaves gaps and stress points that are unused and make sense only, for weight saving in flat parts. For strength in structures, honey comb is the best all rounder. The only other thing that makes a nearly perfectly strong, light and quick print part is topology optimization, like how nature grows our bone structure. Most infills are just a waste and never consider the forces on a part, this is up to a experienced designer, making the part in CAD and prototyping the crap out of it.
@@CADimensions exactly. Just to save time, effort and energy. Also save materials. Car and plane manufacturers doing simulations too before making the actual product.
Lol the answer is already in front of you. Look at the bottle. It's hollow but strong. And the guy who talked about skin and bones, has a mug in front of him.
What do you think makes a 3D print stronger? The infill or the shell?
I'm not sure, but I would says it depend on the type of charge and where it is applied. But, generally I would say the infill, since the geometry can greatly affect how the charge is spread.
That depends on the applied load.
For crush restistance, infill, no questions asked.
For bending, shell thickness will impact the strengh of short thick parts (where bending tension is the problem) while infill will help strengh for long skinny parts like wings (where buckling is the problem).
For tensile strengh, printing orientation has the highest impact and infill to shell ratio has no influence since the only really relevant parameter is cross section.
The designer now has to figure out how the part will be loaded and apply the necessary print settings.
Why is it one or the other. I've always done both.
Their cheap printers. It's going to take hours either way.
pro trick: watch movies at flixzone. I've been using it for watching lots of of movies recently.
@Dakota Oakley yup, have been using flixzone} for years myself :D
The mitochondria is the powerhouse of the cell!!! He said it
I find the easiest example to understand is a solid rod vs a hollow pipe. If supported at both ends with a weight suspended in the center, the top is experiencing compression force, the bottom is experiencing tension force, and the forces balance to zero at the center. Thus, the hollow pipe is nearly as strong as the solid rod. The closer you get to the center, the less effect additional material will have.
yes but do you print hollow pipes exclusively?
When making full density prints, I've had better success with shell all the way to the core as opposed to 100 percent infill. Especially with tpu. It's typically a zero interference pattern, leaving less chances for things to go wrong. Full shell is also more forgiving for flow regulation.
thank you, this is the exact thing i came here for!
What if you put multiple shells within the part with infill between them?
Also, what if you could warp/distort the infill itself to better match the contours of the shell?
You would be better off putting the extra material on the outside.
Imagine a square rod, sticking out of a table it's attached to. You want to hang something on that rod.
In order for the rod to bend down, the top of the rod has to get longer or the bottom of the rod get shorter. For there to be a bend, a curve, the inside radius would have to be smaller than the outside radius.
In the center of that rod, the center just has to bend - it doesn't have to get longer or shorter. Which is easier - stretching plastic to make it longer, or bending it? The center will bend easily. The strength comes from the fact that the top won't stretch, so the entire part can't bend.
The part infill plays in this is just ensuring that the top doesn't collapse down to hit the bottom, that the rod doesn't crease.
This can be seen easily in the construction of cardboard , such as used for a moving box. There are two sheets of paper which makes up the two sides of the cardboard. The paper doesn't stretch, so the cardboard doesn't bend easily. Between the two sheets of paper is just a little wiggly paper (infill) that is only there to maintain some spacing between the top and bottom sheets of paper, the shell.
2:45
I’d say the shell at least for impact resistance. Anything else then it’s the infill
In strictly shells vs walls, walls would make the stronger print. In saying that,to me the strength of the part of determined by the shape of the part and the percentages of infill vs shell that could be optimized to give it better strength depending on the type of load against the part, weather it’s shock load or tensile strength and even then you could go down a very deep rabbit hole as to what shapes (geometric vs organic). Everything can be optimized now days and there are some good videos out there showing part strength with different loads and different material.
I wish you would have shown some tests. I'd like to see the difference between strengths
Thanks for the feedback we'll keep that in mind for future videos.
Can you link this infill brick?
Simple physics. It's the shell thickness which makes the part rigid. You want to add enough shells and just so much infill that it'll be sufficient to create good top layers (shells).
What a lot of us would like to know is when printing Lithophanes, which gives a better finished product. Higher such as 99 to 100% Infill or a Higher Number of Walls such as 20 to 99? There is a Lot of Confusing numbers being put out on Social Media.
One perimeter and 100% infill
As was said, the infill will build strength. I believe filling the inside would make it stronger
sure, at the cost of time and material
7 minutes of 5 guys trying to discuss part strength eh? Simple example: Egg vs cylinder vs bee hive vs topology optimization
Anything round will be strong especially from the top and bottom plane of a cylinder and has decent strength from the sides, but mostly when forces act from the inside out.
Otherwise, a tubular infill adds little support perpendicular to the circular planes.
Honey comb is one of those things in nature, that has great strength, load dispersion and use of space in all orientations.
Anything round leaves gaps and stress points that are unused and make sense only, for weight saving in flat parts.
For strength in structures, honey comb is the best all rounder.
The only other thing that makes a nearly perfectly strong, light and quick print part is topology optimization, like how nature grows our bone structure.
Most infills are just a waste and never consider the forces on a part, this is up to a experienced designer, making the part in CAD and prototyping the crap out of it.
The shell take more load cause of the distance with the mass center
i 3D printed circle in cura but only 1/4 of the circle is being printed in actual
Could you tell me if printing on 100% is stronger or at 50%, I am trying to make a functional part. ?
100% is always going to be stronger than 50%... you're over thinking it hard...
great job!
So i think. Your option should vary on the need. What if having a simulation software to see how different variations of print is better.
That's definitely one way to go about it before making a physical print.
@@CADimensions exactly. Just to save time, effort and energy. Also save materials. Car and plane manufacturers doing simulations too before making the actual product.
Lol the answer is already in front of you. Look at the bottle. It's hollow but strong. And the guy who talked about skin and bones, has a mug in front of him.
I also guess infill pattern, I get strong parts with a cubic infill, interested to keep watching and see what you gus have found
The shape of the infill
Trihex with line meshing. For high impact go 90% infill and figure the lines yourself. You want 80% lines rest infill for flex
Can i ask for help
Damn, a 7 minute video just to say adding an extra wall adds more strength than adding more infill.
not a fan of the format, sorry.
I thought of small working parts something not much bigger than a half dollar should be solid
The shell walls.
Like steel “hardness”
Both
i paused, infill
It depends on the part and its shape.
its the shape of the infill
Infil
Shells ez
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