Summary:

I really liked LoboCNC's sink basket strainer (https://www.printables.com/model/132291-sink-basket-strainer), but my sink was not standard (I think) so I made my own model from scratch. This should fit sink drains of a diameter of 55 mm, but you can scale it as fit. The “net” to stop particles is made via slicing.

Slicing instructions:

There's two models available. The .stl it's just the model without any additions, and the .3mf includes my slicing modifications. I added a prusaslicer modification cylinder of the same size of the internal shape (54 mm - 2 * 1,6 perimeter walls) and removed top and bottom layers, to ensure an infill net is created. I used 30% triangle infill, but you can use whatever you like. 

If you resize the model, just bear in mind that you will need to change also this. 

Considerations:

• I recommend using PETG instead of PLA to ensure that hot water can't deform it, but either material will work anyway if you don't put anything hot over it.
• Support is necessary, but it's easy to remove and doesn't need a lot of it, you can use PrusaSlicer snug supports. 
• I also recommend not going up 40% infill, because although the small triangles look very cool, it will clog in no time and foam has a hard time passing through it. Any 2D infill will work very good.