Ummm ... as far as I know, ALL CF is built in molds ... usually vacuumed to suck the epoxy thoroughly through the weave, and then baked.

Really high-end bikes have better pre-production engineering---more care goes into exactly how many layers of what weave in what orientation will give the widely varied frame characteristics each separate section can potentially offer---and the initial design is more complicated---or at least more heavily researched and engineered.

The open-mold frames are basically reverse-engineered copies, and not necessarily laid up with the same precision or the same weaves in the same directions, because the reverse-engineer wouldn't necessarily know what the original engineer intended.