A quick SCAD spiral generator that allows you to make tpu straps or ribbons of any length or height. 

not my original code but it works well. I got the idea from the recent 3Dprintingnerd video but couldn't find the model. 

r=10;

thickness=.5;

loops=25;

height=20;

linear_extrude(height=20)

polygon(points= concat( [for(t = [90:360*loops]) [(r-thickness+t/90)*sin(t),(r-thickness+t/90)*cos(t)]], [for(t = [360*loops:-1:90]) [(r+t/90)*sin(t),(r+t/90)*cos(t)]] ));