Before creating a bigger three-wheeled model based on Linear Wheels I wanted to make something smaller just for fun. The week after I created RILYBOT 2, I made this 1/2 scale version:

RILYBOT 3

This model is not as symmetrical as RILYBOT 2, mainly due to the difficulty of fitting three motors into such a small space.

This model uses #12 cross axles as its three main legs. The cross axles are connected to each other at mutually orthagonal angles using Throwbot "hip/ankle" ball-joint connectors:

Connecting three axles at mutually orthagonal angles

(There are also three #4 cross-axles on the top that are just for decoration and to make it look a little more like RILYBOT 2. The other black thing sticking out the top is a wire.)

There wasn't enough room to fit three micromotors, so I used just one. The micromotor is supported this way:

Part of the support for the micromotor and its axle

The other end of the micromotor's support

Another view of the micromotor support

Using the Throwbot leg pieces made it very easy to support the micromotor and align it precisely the way I needed it to be.

The micromotor drives two of the robot's axles like this:

Micromotor, crown gear and two axles.

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