Hi, so in the original campaign there is a quest: "The Five Tomes of Imaskar". After each tome you bring to the wizard Eltoora, you can use her lab to craft a magic item. What I've read online suggest there is no limit to how many items you can craft, but after bringing her the Tome of Ice, I crafted one 'Amulet of Natural Armor +3'. After that, every time I put in the ingredients and cast the spell I just get zapped with some lighting. The ingredients are gone, but there is no item.

Is it only possible to craft one of each item, or is there a period of time you have to wait before crafting another item?

Yes, that seems to be the case. Quite ridiculous, considering the game throws so many of these reagents at you, you can hardly carry them all.

Yeah, finding bag space for reagents was a huge PITA, doubly so since you don't know which ones will be useful in future chapters and they can't be found in shops.