6 of one product item ... personalize each item

What you have there is not 6 of one item, but one each of 6 differently engraved items. If the actual item has one engraving field, your product should have one text field. Each different one the customer orders will show in the cart as a distinct item with its text. If they want two of one text, they can order that by selecting qty 2 when adding to cart.