12 cartridges for $335? That’s expensive. Are these proprietary cartridges? If you buy generic 3D printers that accept a spool, you can shop around for filament. Prices vary for the same item. And, how much filament is supplied in each cartridge? Perhaps as much filament as found on small spools that go for $10 each. I’ve bought an assortment of spools of PLA, ABS, and Nylon and there are some pretty good deals going between $10 to $50, depending on quantity and quality. Several grades of Nylon available at different pricing, more expensive than PLA and ABS. I would stay away from proprietary cartridges.
No idea.