The vast majority of desktop 3D printers in use today use one or more lead screws for the Z-axis ... had heard the arguments against using a belt drive for the Z-axis on a 3D printer build ...
However, belts stretch, they wear out, and if you want more precision screws and racks are the way to go. The WorkBee CNC is based on the OX CNC machine, another cartesian router machine built ...
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