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* PCS8UU linear bearings is a modified version of PCS8UU linear bearings, the
block is made of high strength ABS, which is lighter and more flexible.
Why we changed the PCS8UU linear bearings into the PCS8UU ?
To lighten the loads of the carriage in case it slide down during printing and to reduce
the drag of each axis so that the carriage can move more flexible therefore increase
the precision of printing.