Building the MakerGear Mosaic 3D Printer – Part III: The X-Axis

This is the third installment of my series on building Rick and Karen Pollack’s MakerGear Mosaic 3D printer. This part covers assembly of the robot’s “X-axis” linear actuator system, and has proven to be the easiest part of the build so far:  the linear rail, idler pulley shaft, rail stops, and stepper motor are simply bolted onto the plywood frame.  Easy!


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I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I am a long-time contributor to MAKE magazine and My work has also appeared in ReadyMade, c't – Magazin für Computertechnik, and The Wall Street Journal.

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