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The lego build itself consists of three main components.

Printer head

The head moves sides ways using a rack-and-pinion. The motor is linked via a standard elastic-band worm wheel drive to provide steady controlled movement.

Paper feed

The paper is gripped between two sets of wheels sprung with elastic bands to apply pressure. The wheels are linked by a common axle to ensure the paper stays parallel. The provide additional stabilisation the paper is pinned horizontally.

Pen control

The pen moves up and down on a simple rocking mechanism with a counter balance. A number of gears and an elastic band provide some control and stability.