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    I started by thinking of a free-wheeled machine that could have an infinite Y-traverse, but it proved to be too cumbersome and inaccurate.

    So I chose to use V-slotted rails with wheels instead. I then went on Fusion and designed several parts, including the entire X and Z axis parts.

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    Making the Bed and Y Axis

    The bed (Y axis) is comprised of two 500mm or 800mm V-slot rails arranged in parallel. There are four plastic pieces that hold two wheels each, allowing for easy travel of the bed along the rails. I also ran a timing belt across the Y axis under the bed, so that when the Y axis stepper rotates the belt moves.