I've been doing resin casting for quite some time. I see one major flaw with this unless they come out with a silicone filament you're going to have one major downside, undercuts. See with a silicone mold you have good flexibility. And I've had no problem rotocasting with a 2 part block mold by hand when the mold weighed 5 pounds. Now the only filament they could possibly get by with using for a negative mold might be Filaflex but I'm not sure how flexible that filament can be. And you're only going to get a few resin pulls (around 5 I figure) before your plastic mold breaks. And I'm not sure I would want to cast chocolate in a mold unless the mold was food safe.