Customized version of https://www.thingiverse.com/thing:4150611

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=4150611

Using the following options:

hole_diameter = 55
extend_distance = 10.0
cover_thickness = 2.5
gap = 1.0
frame_thickness = 2.5
frame_height = 10
cone_height = 15
inner_diameter = 15.0
$fn = 108
slit_width = 1.8
num_slit = 10