Marble Machine

This is another set of slight tweaks to the very fun Marble Machine by Linax.

I have an 8" (200mm) printer so I have modified the right track to be able to fit (*barely*) on my print platen. The other parts fit, as-is, on an 8" printer, but again, barely. (All the long parts need to be rotated by 45 degrees for printing.)

I have also enhanced the lobe wheels by integrating them with the spacer, which keeps them much better aligned on the shaft. I made a stepped shoulder bearing, two of which are used to keep things aligned.

Finally, my motor cover is slightly smaller to fit the base a bit better.