Funbot M8 version

I had wanted to try a Funbot with 8mm Rods and Bearings, So here's my attempt at making that happen. This is just the parts required to redo the axis to 8mm.

Currently set for 15.5mm diameter for LM8UU 15mm OD bearings, and 8.15mm diameter for 8mm OD Rods.

This is also modified to also be able to use a T8 Leadscrew on the Z axis.

I think It's all good now. I will add accessories from here on out.

After nearly 3 years of using my Funbots, I find them very reliable printers. I'm going to try to do some updates to the files to make it better.

More Improvements coming soon.

12/3/18 I added a spool holder that mounts on top and another version of the extruder holder that works with the new spool holder. Use a M4 size screw to attach spool end, amd M3 for mounting to Z top.

6/12/18 I updated the Z top part so that either a 608 bearing or a KFL08 Pillow Block could be used. I updated the Y stepper mount to have three mounting points instead of two.

5/21/18 I removed th