[Mark Rehorst] had heard the arguments against using a belt drive for the Z-axis on a 3D printer build: The belt can stretch, causing inaccurate layer height. If power fails, gravity will totally ...

Belts on a 3D printer should be tight enough, but not too tight. That can be an iffy thing to get right for someone who lacks familiarity with CNC platforms. Prusa Research aims to make it a bit ...