About this 3D model

After suggestion from [mikehu](http://www.thingiverse.com/mikehu/) I designed a small upgrade for the Z-axis which some people might find useful. Instead of using two rods on each side of the Z-axis this upgrade uses four with the two extra placed a bit to the side of the first two. This will hopefully make the axis a bit more stable. I haven't printed these parts yet so I can't say if it will work or not, therefore "work-in-progress". A 3D pdf is available [here](https://github.com/hampussandberg/RodBot-Quad-Z-Axis/raw/master/Quad%20Z-Axis.PDF) to see how it should look. ##Updates: **2014-06-21:** Fixed an error on the base block that made it hard to tighten the M10 nut. Removed mirrored parts so you have to mirror them yourself. ##License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License .