Customized version of https://www.thingiverse.com/thing:953781

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=953781

Using the following options:

inside_dia = 17.75
outside_dia = 17.75
dome_h = 9
rim_support_thick = 0
inset = 20
num_gussets = 0
gusset_depth = 0
spiril_degrees = 0
resolution = 128