Sphere-O-Bot Remix

This is a remix of the JJ Robots version of the Sphere-O-Bot, when I assembled mine I found there was a great deal of slop in the axis and the drawing arm that would have a negative impact on the outcome of my prints.

I redesigned the axis support to hold the bearings snugly. The bearings floated in the original which allowed play in the axis, I found it difficult to align the egg with the slop in the axis. If you use mine it's helpful to put the bearings in the freezer for an hour or two, this allows the bearings to shrink a little bit during assembly, even still it's a snug fit.

To correct the arm I designed an arm specifically to hold a Sharpie Ultra Fine Point marker. This is only intended for the Sharpie and holds the pen at the right height and snugly enough so there is no lateral movement. It allow precise alignment when changing pens for a color change. For another project I added an arm for a Jot Marker, both are included. The Jot marker arm has the shorter sleev