Running activity visualization beads

The purpose of these beads is to visualize your running or walking activity. For each run/walk you can print a parametrized bead. It visualizes three parameters:
* Running or walking __duration__: __Bead diameter__
* Running or walking __distance__: __Bead length modification__
* Average __speed__: __Resolution__ (higher=faster)

Use the easy-to-use __Customizer__ (click on "apps") to create beads that visualize your own running (or download the OpenScad code).

Duration is more importan