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Suggested minor improvement to the Y-carriage.
Although it looks neat and tidy, the two stands of timing belt between the motor and the Y-carriage do not need to be parallel for XY-core to work correctly. This means it is possible to move the non-toothed idler pulley in the direction of the Y-rail. Since the position of the non-toothed idler pulley determines the x-size of the Y-carriage, making this move reduces the x-size of the Y-carriage and so increases the X print size.
This reduction gives a useful addition of 16mm to the X print size.