AM8 - X 12mm Upgrade + reinforcement

*Note: This is only a tiny part of my AM8 upgrades. You can find the links to the other parts at the bottom of the description.*

*If you need SC8UU compatible sinter bearing housings, have a look at my housings for 12x15x10 bearings: https://www.thingiverse.com/thing:3016075*

*A version for 8mm X rods is also available in the files section*

About
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This upgrade intends to improve the stiffness of the AM8 X Axis, while the goal was to keep AM8 compatibility. It does also use an