In the past few years, we have covered a whole host of smart laser engravers here. The Amika is also worth a look. It is a portable 5W laser engraver that works on metal, leather, wood, plastic, cardboard, and everything in between. It has a 4th-axis to take on cylindrical objects.
The Amika has an engraving area of 120 x 120mm. It can create engravings at a rate of 850mm per minute. You can power this device with a power bank. It comes with a shield and an exhaust fan. You can connect your Amika to your iOS or Android device to upload images.[where to get it]