Duct tape is made from 3 slime balls and 3 strings. Place it on the ground, then right-click it with a damaged item.
Each click will use up some of the duct tape, and restore up to 1/6th of the damage on the item. Yes, I know it is flat and square…. It’s Minecraft… It’s a patch of duct tape, not a roll! Slimes and Spiders look out!!!!