Customized version of https://www.thingiverse.com/thing:5189611

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=5189611

Using the following options:

size = 25
die = 18
roundness = 0.15
letter_ratio = .1
depth_ratio = .03
sides = [1, 2, 3, 4, 5, 6., 7, 8, 9., 10, 11, 12, 13, 14, 15, 16, 17, 18]
$fn = 16
kite = .052
angular_fudge = 3
radial_fudge = .125