Customized version of https://www.thingiverse.com/thing:4634255

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=4634255

Using the following options:

hole_diameter = 30
flange_diameter = 34.5
flange_thickness = 1.5
catch_count = 6
catch_height = 3
catch_thickness = 1.5
catch_lip = 1
catch_offset = .5