Extruders on rails?

To reduce the weight from the hotend gantry, Bowden tubes are often used to remotely deliver filament to the Hotend.  The trouble with Large printers and Bowden tubes, is that the tubes generally need to be very long to span the length of the printer.   To address this problem, and keep the Bowden tubes as short as possible, we’ve put the extruders on rails!

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