Modified version of a shower drain to better accommodate sinks. The model I modified, when shrunken down, didn't drain well at all and was more annoying than useful. I removed all of the extraneous rings in order to make the water drain as well as possible but still prevent things from falling in. It now drains significantly better, and I've put one in every sink in the house.You may need to resize this in order to fit your drain. Luckily, it's a quick print!