Wood filament grain app

The 3dowl.stl file included in this posting is not mine, it was created by satoshi and is included here only because Thingiverse demands the inclusion of at least one of a set of file types. When I posted this script originally there was no such rule, but with this August 2019 update it has become necessary.

I've been experimenting with some wood filament from Formfutura (http://www.formfutura.com/) and Mooncactus has created a grain script in python that converts a gcode file into one tha