My handmade engraving unit explainedshedlife (41) in engraving • 7 years ago (edited) My homemade hand engraving unit explained, teardown of my 240 volt pump. If you use the sizes I have mentioned you should be able to make something similar. If you use a 12 volt pump you can change the speed the motor runs. ▶️ DTube ▶️ IPFS engraving graver dtube