Anet A8 Z-Axis rework

This is a rework of the Z-Axis drive system to reduce the infamous z wobble and to increase Z resolution.

The 1:2 gearing allows print layers that are a multiple of 0.02 - 0.04, 0.08, 0.10, 0.12 etc. whereas the factory system allows for layers that are a multiple of 0.04 - 0.08, 0.10, 0.12 etc.

I have successfully printed down to a layer height of 0.04 with no noticeable Z-axis wobble.

Parts needed:

2x 20T 5mm bore GT2 pulley
2x 40T 8mm bore GT2 pulley
2x 150mm closed GT2 belt
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