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Questions tagged [cad]

Computer Aided Design (CAD)

2
votes
1answer
43 views

How do I keep the .stl files from being resized while exporting?

I made a few models in Autodesk Inventor. When I tried to get them printed, the printer created a model smaller than the model I made in Inventor (270mm x 200mm). Is there a way to keep them from ...
2
votes
2answers
106 views

Hollow wing for rc plane

I am trying to print a wing for a rc plane with my 3D printer. In order to make the wing as light as possible I need to hollow it (and afterwards put some stable structure there). I've tried the ...
4
votes
2answers
124 views

What is the point of diminishing returns on the STL refinement level in Fusion 360 on an Ender 3?

When exporting an STL from Fusion 360, one must select an STL refinement level to use for calculating the maximum triangle count. For FDM printing (0.05mm and above layer heights), where is the ...
3
votes
4answers
151 views

How can I have a large 3D printed object?

I have a concept that's roughly 18"x30" (about 457x762 mm), and I just realized that the Makerbot and similar printers only allow dimensions around the size of a piece of paper. What are other options?...
9
votes
1answer
128 views

How to add “skin” to a Voronoi shape?

Suppose I'm given a shape with a Voronoi pattern, such as this lamp. I'd like to be able to add a "skin" which covers the complete shape on the inner surface so I could print it with translucent ...
4
votes
1answer
339 views

How do I compute the surface & volume of a large amount of STL files?

Please, how do I compute the surface & volume of a large amount of STL files ? I have over 3000 STL files, and I want to know their respective volumes and surfaces. I will use this data to be ...
4
votes
2answers
541 views

What is the difference between STL and OBJ files and which one should I use?

One of the CAD programs I use is called TinkerCAD, which lets you export your design in either STL or OBJ form. What is the difference between these two file types? And which one is better to use?
4
votes
4answers
358 views

STL to STP CAD Conversion

Does anyone know of a good way to convert a 3D print file, like STL, to STEP - a useable file format for plastic injection molding companies? I have tried to convert the files through a couple of ...
1
vote
1answer
247 views

Make smooth curves in GCode

I am getting started with GCode, and I don't know all the commands. Is there a way to smooth a path between two points? I wrote a program which makes GCode from a silhouette. Problem is, when it looks ...
5
votes
3answers
146 views

In Fusion 360 how do I select an entire 3D object, not just its sides or faces?

I'd like to mirror a triangular prism I made. However, whenever I select it I am only able to select the faces or sides. Is there a way to select the whole 3D object to move or mirror it?
4
votes
1answer
269 views

Can the `render` function be used to speed up rendering?

I am designing a moderately complicated piece in OpenScad. It renders fast enough in preview mode (1s). But when i do a full render so I can export to STL, it takes ages (In the 10s of minutes) I ...
3
votes
2answers
155 views

How to modify 3D model of body?

I'm relatively new in the field of 3D printing and design. By now I've created and printed some technical objects with TinkerCAD, but now I've a task, which I don't know how to solve. I have the ...
4
votes
1answer
890 views

How to design a worm-gear in FreeCAD?

I want to print worm gears for my robot arm. I would like to design it in FreeCAD. Normally, I would use involute gear for regular gears. However, this tool cannot be used for worm gears. I can't find ...
1
vote
1answer
60 views

I am looking for laser cut cads for my prusa i3?

I have this prusa i3 printer(I don't know what model is it): My bed part is broken. And I am looking for the cads to laser cut them! this is my bed pic:
5
votes
3answers
181 views

FEA in 3d printed solids

I would like to get a pretty accurate method to do finite element analysis (FEA) on my 3d designs considering the infill. I use Autodesk Inventor to design parts but the FEA can only be applied to a ...
3
votes
3answers
240 views

How to concave a cylinder with Onshape?

If I have a 3D cylindrical extrusion (in Onshape), how can I scoop, carve, or indent a concave/parabolic curve in one of the ends? The yellow surface is the target. Here is the basic shape I'm ...
0
votes
1answer
47 views

Is B-REP a ready to print mesh

before a mesh can be printed it needs to be 'repaired'. According to most tutorials that is including making the shape close and removing inner shapes. Reading through B-REP in Wikipedia there is no ...
2
votes
3answers
395 views

Converting a mesh to constructive solid geometry

I have a mesh of a bowl that has the perfect shape of half a sphere. I want to easily convert it to the containing sphere solid and a box solid that will be subtracted from it. Googling mesh to solid ...
2
votes
0answers
69 views

Plastic most closely mimicking Ultem in Autodesk Inventor

I'm trying to run a stress analysis on an assembly of parts that will be printed in Ultem 9085 (on a Fortus 400MC). I am trying to find a plastic that most closely mimics the material properties of ...
6
votes
2answers
2k views

Can a 3D model of a copyrighted work be rendered legally without infringement?

I know this is still gray territory and it is asked so many times within the 3D printing and maker community but I'm curious about the limits of 3D models and were it touches on Free Use and ...
1
vote
2answers
314 views

Can I design or remix a model in SketchUp Make and legally share it via Thingiverse, MyMiniFactory or similar?

SketchUp Make is licensed for non-commercial work only. This includes the output from the software. Trimble Navigation Limited and/or its affiliates ("Trimble") gives you a personal, worldwide,...
6
votes
2answers
266 views

Mesh/Geometry quality

tried searching but couldn't find anything. I do not have a 3d printer so can't really experiment on my own, which means that when I am going to order a 3d print I want to get it as good as possible. ...
6
votes
2answers
91 views

Resources/methods to construct STL files using disparate parts using OpenSCAD

What resources or methods would OpenSCAD users suggest to piece together disparate STL files? I'd like to take an existing STL model-library of STL parts (head, torso, arms, legs) and make it a ...
3
votes
1answer
122 views

Converting Injection Molded STLs to printable STLs [closed]

I bought a 3D printer kit a few years ago, and it's been working pretty well, the kit was made with injection molded parts. -- It's similar to a Huxley, and through the years, it's started to turn ...
2
votes
1answer
307 views

File Input data types

I'm a newb and don't know much about 3D printers. In visual basic I can create vector data of 3d objects,that can be loaded into a binary or text file. Can files like this be used with a 3d printer? ...
13
votes
6answers
582 views

Choose infill percentage

Since I'm running a 3D printing facility of an engineering school, students are always wondering how much infill percentage affects the stiffness of the part. I know that it is impossible to get a ...
1
vote
2answers
193 views

Scan to vector?

I have some design diagrams only on paper. Scanning them to bitmaps is easy, but I've had no luck getting useful vectors out of them. I've tried vectorizers in programs like gimp, and a few online ...