> For the complete documentation index, see [llms.txt](https://monasheng.gitbook.io/zerotohero/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://monasheng.gitbook.io/zerotohero/3d-printing-zero-to-hero/advanced-skills/advanced-cad.md).

# Advanced CAD

In [STL Export](/zerotohero/3d-printing-zero-to-hero/core-skills/stl-export.md), we took for granted that a CAD model you might wish to print would be suitable for this manufacturing technique.

In reality, design-for-3D-printing is an entire field of it's own. Design decisions in CAD that might otherwise be trivial (e.g. the presence or features of a round or chamfer) can have a large effect on the printability and usefullness of a finished part.

In this chapter, we will scratch the surface of this exciting field,  focussing on:

* Selecting [3D Printing Tolerances & Fits](/zerotohero/3d-printing-zero-to-hero/advanced-skills/advanced-cad/3d-printing-tolerances-and-fits.md), and.
* Broad principles when undertaking [CAD for 3D Printing](/zerotohero/3d-printing-zero-to-hero/advanced-skills/advanced-cad/cad-for-3d-printing.md).