SLASH (Sliding LAteral SHaft) Extruder. Rigid shaft, remote mount, direct drive extruder, for Cartesian i3 printers

5/16/2020 Update: added model of the Z carriage and the pulley mount for the opposite end of the X axis.
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5/5/2020 update: Video of the extruder in motion here. http://imgur.com/a/KaxNhek
Progress on building the printer has stalled for now.
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This is a development level design of a shaft driven remote drive extruder. Unlike the flex drive extruders that use a springy flex shaft and worm gear, this extruder us