This is a strainer for my bath plug hole (bath_strainer) bath_strainer1 is a revised version... (see stl files) I have made a recessed hole in the middle of the strainer to aid water flow, I also added some more holes. I made the holes 2 mm but I may need to increase to 3 mm... Still a work in progress but works with regular cleaning :) It has an outer diameter of 70mm and an internal diameter of 43mm. The outer rim is 1 mm thick, overall it is 6mm thick The holes are 2 mm. This is my first design... Maybe some adjustments are necessary... I will update after some testing :)