Ball-track with an elevator

I soldered a ball-track using a steel wire and put an arduino-clone to control the elevator lifting a steel ball.
To make a sand-like surface - epoxy and ceramic dust were used.
To drive the elevator I used a NEMA17 stepper and DRV8825 stepper driver.
The speed of a mechanism is controlled by the know on the front panel.

[@DanMcB1]

Very cool

[@kaasmeester5903]

Lovely project. The most complicated and satisfying paperweight :)

[@syedaliaizaz2031]

Wow

[@cfm1958]

What kind of wire did you use?