Bathtub Drain Cap

My bathtub drain is corroded and doesn't seal well to hold in the water. I will need to replace it someday, but until that happens I designed this model to provide a solution. This bathtub drain cap goes overtop of the existing closed drain and seals on the smooth surface of the tub surrounding the drain. If your bathtub is not perfectly flat around the drain this will not work for you. The cap is 10cm in diameter and goes over the metal knob on my drain which is about 17mm in diameter. I designed it with a rib grip instead of a central knob to make it easier to break the vacuum seal when removing. I played around for aesthetics with the top surface surface pattern and set it to an octagram spiral and added a modifier to force concentric for the grooves to reduce defects.Boost MePlease like and boost if you find it useful. Thank you.