Lightpainting Interval Exposure Tool

This is a tool designed to be used in long exposures. It spins a disc with open segments in front of a camera lens to interrupt a long exposure in intervals. This creates a unique look in light trails and any other technique used in lightpainting.

This tool uses a geared 12V dc motor with around 720RPM with a standard PWM controller.
The controller potentiometer knob is mounted outside the box along with a power plug and a switch for power. The discs are separated to be printable but need at least 300x200 print area.

The slit disc right is actually a little wrong, it should have been mirrored. I realized this after i printed and glued them together, but left them as they are because this creates a slight irregularity that adds character and makes the pattern look less artificial.

Example images show which type of disc created which type of effect.

German instructions can be found here:
http://forum.lightpainting-helpdesk.de/showthread.php?tid=298

Englisch instructions