Why one by one (if that's how you do it, I guess)? You can put 25 and 25, or 50 and 50, or any other number in the crafting slots and keep pressing the "craft" button, or once crafted at least one piece, using the remembered recipe with the "-" and "+" signs to increase/decrease the amount, then pressing "craft", to make the items "en masse". You know, you can use the recipes, don't you? After making the item once, it will be added to the recipe list.
I tried doing that and it won't craft. It just fails.
