This is a flow through cup for chemistry labs, or any labs, with a need for a flow through cup. You connect tygon tubing to the top and bottom nozzle, then connect the bottom to the demineralized water source and the top tubing to a drain or sink.
Ideally this can be used for conductivity probes, ion chromatography sipper tubes, or whatever you need to keep clean or low conductivity to.
I printed mine in ABS plastic. It leaked a little (due to the nature of 3d printing in layers). Take a dollar store bottle of acetone (Toe Nail Polish Remover) and a dollar store paint brush (fine brushes for kids paintings) and smooth the outsides where it may leak (mine just leaked a bit at the base and the bottom nozzle). Once I smoothed it a couple of times it stopped leaking. I then spray painted the outside with high gloss clear coat spray paint for appearance. That's optional as the print inself turned out great. I put 2mm supports under and inside the nozzle's of the object when I printed it.
I also made a blue one out of petg which turned out great as well.