In addition to the heat-problem described by |Robert|:
The resin will most likely glue firmly to the PLA. You would need a very good release coating to prevent that. Test the compatibility of the release sprays or coating with the resin: if incompatible, it might prevent curing, and you would end up with a sticky mess. Release-sprays might make painting difficult; you would need to degrease thoroughly.
Concerning heat: in the old days, when mixing epoxy resin in plastic cups, or even in metal (lead) cups, I often saw these melt due to the heat in the left-over resin. So you would need a slow-curing or low-exotherm resin.
If you keep these things in mind, I think it is worth trying.
Another option would be to make a silicone mould from a 3D-printed part, and use that silicone as base for applying the carbon fiber and resin. Silicone can withstand much higher temps, and it is by itself non-stick. But even then, thoroughly applying release spray greatly increases mould-life. Silicone is porous for oils, solvents and resin-vapours: so they would soak in, and over time cure in there and destroy the silicone's flexibility.
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IRobertI 521
I think heat might be the biggest issue here. Depending on how hot the resin gets as it cures it could be enough to cause the PVA-mold to deform due to the high stresses that gets put on it due to the vacuum.
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