I would like to learn how to design 3D objects for the use of 3D printing in manufacturing.
So what is the best CAD software for this purpose?
I use windows OS. And I have ni price limit.
I have no experience in CAD, I'm a beginner.
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I personally use PTC Creo (formerly Pro Engineer) for Uni. It is quite capable and widely used in both education and industry.
I has many features and a fairly nice GUI. However I feel like some introduction to this software may be needed if you never used CAD before. For this please ask at your University/Company or watch some of the official tutorials.
Creo is available both in a parametric and direct modelling version.
I have only worked a little with NX but most of the big commercial CAD softwares are somewhat similar, so I would simply go with your employers recommendation.
Solidworks I would consider a simpler CAD. This will easily suffice for simpler work and might be a great choice for a beginner.
FreeCAD is Free and Open source. It has a lot of features but in my opinion it is not as easy to use as Creo and NX. I would recommend this for low cost or low level CAD work. It also integrates many different styles of CAD into one (openSCAD e.g.).