This is a new version of the parameterized Servo wheel for mobile robots:
http://www.thingiverse.com/thing:9071
These are the wheels used by many printbots such as Miniskybot or Scout. The improvements of the Version 4.0 are:
The sources are stored in the Miniskybot 2 github:
Servo-wheel-4-arm-horn.stl | 311.1KB | |
Servo-wheel-6-arm-horn.stl | 334.0KB | |
Servo-wheel-rounded-horn.stl | 348.5KB | |
Servo-wheel.scad | 6.3KB |