I have never built a functioning generator yet - so aiming to finish this one and charge my phone via hand crank.

My design started from what magnets i had available - 22mm x 15mm
Everything else took shape from there.

Still busy with this, will update as I go along

inspiration from http://www.thingiverse.com/thing:1766551

2016-11-07 -- I have got this working and I am getting just over 9v spinning the shaft with my fingers. which i dont think is too bad. I dont have anything else to compare this too, this is the first generator I have made that produces electricity.

Things i did not take into account:

The Wiring - wires everywhere. this is something you need to plan for.
Geometry of the rotor & Stator - my rotor has 4 magents and stator 6 coils. at the moment only one set (opposite coils "Fire" at the same time)

I have wired the set of coils (opposite ones) in series and then to a bridge rectifier.
then connected these three sets in series with a capacitor to smooth out the voltage drops.

works awesome - now im at a point where i want to charge my phone but more electronics and circuitry are needed.

2016-11-11
I have uploaded a picture of the circuit
i am not sure on how to proceed from here.
should i connect a buck/boost converter to achieve a stable output?
is this the best circuit ?? if you have any ideas / comments let me know.