Printer Calibration; Spaces and Fill

I created this model to speed up how I go about calibrating my Thing-O-Matic and associated skeinforge settings.

It consists of the following parts:

- One comb-shaped structure aligned on the X axis with teeth spaced 0.1mm to 1.0mm apart in 0.1mm increments.

- One comb-shaped structure aligned on the Y axis with teeth spaced 0.1mm to 1.0mm apart in 0.1mm increments.

- One short square for checking fill algorithms.

- One 608 bearing scale ring (OD: 22mm, ID:8mm, Height: 7mm) for checking inner hole diameter.

Source is maintained at https://github.com/clothbot/makerbot/blob/master/tests/thingomatic/spaces/test_spaces.scad