Customized version of https://www.thingiverse.com/thing:4149228

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=4149228

Using the following options:

hole_diameter = 55
extend_distance = 10.0
inner_diameter = 25
outer_ring_width = 3
cover_thickness = 2.5
slit_width = 1.8
num_slit = 10
gap = 1.0
frame_thickness = 2.5
frame_height = 10
$fn = 108