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[LambdaFF]

Rotor blades ! A good way to leverage stiffness.
Screws and structural reinforcements as well.

[STRYKR]

Customized carbon fiber stringers for skis and snowboards. With a clear topsheet they could serve a second purpose in the form of art.

[tetrahemicon]

Stronger parts for mechanical toys.

[Coin3]

So far I have been using my sample of Poly-ABS for parts that might benefit from added strength. It really doesn't seem all that different from normal ABS, but it looks to be a nice little boost so I'm happy with it.

[cwmain]

Helmets or protection

[AxisLab]

Exoskeleton prototyping, and electronics housing on the finished product

[alodia]

nice, high strength i can make unbroken gears for my robots

[super dooper]

A custom carbon fiber Lamborghini body for a go kart, that used to be golf cart.

[krauerking]

I'm really interested in the high temp PLA since I find it to be stronger than ABS and since im in Arizona PLA doesn't last well but i can imagine it being used in a higher friction situation where heat causes warpage.

[corben33]

There are so many, where to begin. I would say small everyday objects like cup holders, change organizers, or even housings for electrical components. But really the list is endless.