In this video, I build an external gear pump and it works pretty well. I have built in this channel a lot of water pumps but this is a bit different from all of them. If u are interested to build this gear pump on your own, all that u need u find on these links: _______________________________________________________________ FREE 3D PRINTING FILES: https://thangs.com/Lets-Print/Body1-22538?utm_source=youtube&utm_medium=video&utm_content=inf&utm_campaign=lets_print _______________________________________________________________