Tonight I was able to take a break from unpacking to start designing the Z-axis carriages and Mono-Filament drive. Corey and I decided to go with this style drive as belts/pulleys would have been too bulky to fit effectively, neither of us are impressed with any of the belt driven 3D printers anyway. 

Here you can see the mockup for the Z-axis carriage internal components. Two PTFE or Acetal linear bushings (.375 in ID), Double brass 1/4-20 nuts with anti-backlash spring, the main spindle support bearings, and the main drive spindle (This spindle is for the X-axis drive).

 Here is a screen shot without the upper bearing, the spindle is a very simple design and will be machined out of 6061-T6 aluminum, the purple clamps will be 3D printed for the time being. 

The next stage is to design the carriage to support all of the components, the Y-axis drive will be slightly different and I'll be working to mock that up tomorrow to start designing both Z-axis carriages. 

The top bearing mount was also bothering me, and will need some artistic work to make it more visually appealing. I added two shallow reliefs in an attempt to make it look better. 

Tomorrow morning I will also be 3D printing the lower motor mount to check the fitment with the stepper motors and the upper motor mount to show a sense of scale for the TOME.