I made this to replace a store bough strainer that would allow water to pool just a couple millimeters around the plug leading to water stains. I made this one a little wider to cover up the cosmetic imperfections of the sink and the horizontal line funnels the water around the strainer into the drain so no more pooling. 

The model was made in two pieces because I'm practicing ways of not using supports when printing. Works great. 

Designed to fit a drain about 28.8 mm wide but it has some flexibility. 

– UPDATE --

I uploaded new models to take into account that most sinks usually have a bowl shape. I added supports to the underside of the plug and made it easier to insert the drain.