One of the critical components of the Plant pod device design is integrated solenoid pump. Before starting manufacturing of any of the base components, we need to be sure that this pump design will work correctly. This is a proof of concept and test rig at the same time. We need a tool to test different spring and coil combinations. Pump's main body and piston will be machined parts, due to the tight tolerances, rest of the system will be 3D printed parts, and some "of the shelf" hardware, like nuts, bolts, springs etc. Here are some images.