AM8 Parts

I customized a few of the parts for my AM8 frame. Specifically...

* Made modular mounts for the mosfets, Anet board and Raspberry Pi so you can print these separate and mix, match and arrange as you like. I added standoffs with 3.2mm holes which can accept either a 3mm bolt / nut or a #6 3/8" or less self tapping screw (SAE is easier to come by and cheaper in the U.S. for obvious reasons). These were made / remixed based on pheneey's original Anet board mount from the AM8 metal frame thing.
* Remixed thaug29's z-rod holders with bearings back to the orginal design and included his bearing holders but with the bearings put in from the top rather than the bottom (too worried that over time the bearings would come lose and drop down the threaded z-rods).
* Remixed Construtor's spool holder to have smaller mounts and require less bolts to hold on to the frame.
* Remixed thaug29's bowden extruder mount for 2040 extruded aluminum.
* Remixed gmars23's alignment tool to be used for ali