This will fit most kitchen sink sized drains (79mm inside diameter, 116mm skirt diameter).

Customized version of https://www.thingiverse.com/thing:3176960

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=3176960

Using the following options:

strainer_type = square
strainer_x_mm = 2
strainer_y_mm = 2
strainer_thickness_mm = 1
strainer_grid_spacing_mm = 1.5
drain_diameter_mm = 79
drain_depth_mm = 10
drain_sleeve_thickness = 1.5
skirt_diameter_mm = 116
skirt_upper_diameter_mm = 110
skirt_thickness_mm = 2