Customized version of https://www.thingiverse.com/thing:4341818

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=4341818

Using the following options:

l = 80
w = 50
h = 15
r = 3
$fn = 36
max_angle = 55
bottom_t = 1.8
top_t = 1.8
side_t = 1.8
rail_play = 0.2
rail_vertical_play = 0.1
front_play = 0.3
hook_play = 0.2
catch_play = -0.2
back_play = 0.3
top_front_t = 1.2
front_support_t = 1
front_slope = 0.5
rail_min_t = 1.2
rail_depth = 0.6
rail_straight_h = 0.4
button_l = 8
spring_l = 4
hook_slope = 2
catch_slope = 0.5
notch_t = 0.6
hook_opening_w = 1.5
hook_l = 2.5
hook_t = 0.8
hook_straight_h = 0.6
hook_w = 2
anchor_min_t = 1.8