Spiral
thingiverse
The spiral is a single 360 degree turn. It is designed to be stackable to allow for as many or as few turns as you'd like. The photos show that I used 2 stacks of 4 spirals on my marble roll.
Download Model from thingiverse
With this file you will be able to print Spiral with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Spiral.