Calculating gear ratio for leadscrew My calibration at my printer is okay. When I try to move 10&nbsp;mm, it's exactly 10&nbsp;mm.

But I want to know what is my precision for Z-axis.

(not posting the link of the product maybe it's not okay for the platform)

Spec for leadscrew:


Lead screw diameter: 8&nbsp;mm
Screw pitch: 2&nbsp;mm
Lead of thread: 8&nbsp;mm




My question; is my gear ratio 4:1 or 1:4? It's giving different results.
Your lead screw nut advances 8&nbsp;mm every complete rotation of 200 full steps, so a single full step would change the height by 8/200 = 0.04&nbsp;mm. This implies you need to set the layer height a multiple of 0.04&nbsp;mm.

The gear ratio of 4:1 (a reduction) is required to get to your desired 0.01&nbsp;mm layer height, but that is a very uncommon and a too small layer height to use.