I recently ust watched an interesting video that show the inside of carbon fiber bicycle frames and forks and how to properly cut a carbon fiber seat post.

Cutting up Expensive Carbon Bikes // Inside High-End Bicycles

https://www.youtube.com/watch?v=EZbg5hCRyvs

What I found to be quite interesting was how a wrinkle in the cloth layup or a small void can really lower the integrity of a carbon fiber frame, fork or wheel.

This guy uses a machine similar to an ultrasound machine to check for hidden flaws in carbon fiber frames, forks, wheels and/or other carbon fiber components.

Cheers