DIY LASER Engraving/Cutting for Dummies : 9 Steps - Instruct ..
To engrave cardboard you need to cut into piece of size 2..5 cm x 2..5 cm.. We put the design for the engraving in the laser carver .. Change the Burning time to 60 sec for outline image.. For filled image consider changing the setting to 30-35 sec.. It ensures that the cardboard does not burn..