Originally Posted by Luckless
likely the biggest factor limiting that is properly centering the core and being able to put the shell on cheaply and effectively. If it is off center by even a small fraction of however you want to measure it, then you'll get random spinning and could have very drastic effects on the flight path.
This is kind of like golf ball manufacturing, and they will never make a perfect ball until they can make them in space. The reason is gravity.
As the molten plastic cools and hardens, gravity is taking effect and making one side slightly heavier and out of balance.
If you want to see this effect. get a short drink glass and fill it 3/4 full of water, and add 3 or 4 Tablespoons of salt. stir. Get a golfball and put it in the glass, if it doesn't float, put more salt in until it starts becoming bouyant.(floats) When it is floating, get a sharpie marker and put a dot on the very north pole of the floating ball. Now give the ball a spin, and let it go until it comes to a complete rest again. And you will see that the dot will return to the N.pole again. If it doesn't,(not likely but possible. 3/12 ) put that ball away for your next game of golf.
The light side is at the north pole.
I assume that it would create the same kind of problem in BB manufacturing. We have to deal with it.