Customized version of https://www.thingiverse.com/thing:1234005

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=1234005

Using the following options:

strapWidth = 25
strap1Thickness = 3
strap2Thickness = 8
opening1 = 16
opening2 = 4
opening1Position = 0.5
opening2Position = 0.1
length = 20
thickness = 2.5
margin = 1
resolution = 30