Screw, Roll, and Point

The idea

The design was roughly conceived around a 3 foot long lead screw with a stepper motor connected to it that Jason had rescued from the garbage at QD Vision. Taking advantage of the prebuilt assembly as the X-axis of our drawer, we designed the Y-axes to be a roller controlled by another stepper with the goal of minimizing the quantity of building needed for a typical x-y gantry system. The last design decision was the "turret" that would sit on the chassis of the lead screw. It would need to hold all colors and actuate them against the roller, so we envisioned a wheel to hold the different colored markers on a servo with a guide to ensure it would touch in the same place each time.