Traction for icy conditions

It's kind of late in the season to be worrying about ice...but I guess in the southern hemisphere it's good timing.

Printed these on a FF Creator Pro in NinjaFlex at 70mm/s with the [Flexion Extruder](https://www.flexionextruder.com "Flexible filament extruder")

I used the full build plate for this, but it was still a bit tight on a size 10 shoe. A lower durometer filament would also be nice (Be sure to tell NinjaTek if you also would like the ability to print in softer materials). The