Test Tube Holder (for Prusa Mendel, 8mm, 5/16)

I use a glass test tube for ABS juice (acetone/ABS) that I use to help prints stick, but the test tube rack is way over there [points across room], and that's a bit inconvenient. So I made a little holder for it that snaps the ~16mm diameter test tube into place right onto the frame of the Prusa Mendel -- or any other 5/16 inch or 8mm rod.

The clip alone can hold the test tube in place, but I didn't want the tube to vibrate out on long prints, so there's a base that keeps it in place.

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