The file 'Sealed Water Test 3D Printer Model' is (stl) file type, size is 19.6KB.
Designed to prove that some printers allow water to seep-in.
Print it - toss it into / under the water.
Soak for 24, then chop / vice it open to prove / disprove same.
Feel free to coat with barnacle / marine / epoxy glue + repeat to prove the opposite.
SubTst01.stl | 59.8KB |