Zip file including the below 3D models in STL, IGES and STEP format. These files are available for free to teachers who have a RoboBlocky instructor license. Links to the individual files are provided in the Engineering Design with Linkbots curriculum.
 
3.5" Wheel
4.0" Wheel
Metal Ball Caster
Kickstand Caster
Soccer Scoop
Bridge Connector
Gripper
Box
Omniplate
3" Link Plate
4" Link Plate
7" Link Plate