Marble Machine... machine

Are your muscles sore and your fingers calloused and bloody from playing with your [Marble Machine Kaleidoscope?](https://www.thingiverse.com/thing:4429805) Surely there must be a better way!

This is a hand-crank device for running your marble machine automatically.

How well does it work? Meh, fine. In retrospect, I should have made the outer piece of the marble machine move up and down. Live and learn.

**Instructions**

First, print everything.

Do yourself a favor and lightly sand the rectangular shaft on the "spider" part. Also, make sure the "crank" part fits snugly into the "cam" part. You should be able to insert and remove the crank from the cam with some resistance. Lightly sand the last 15-20 mm of the crank to help with the fit.

Next:
1. Glue the "core" part into the "base" part.
2. Hold the "cam" by the fat end and slide into the "core" to align the square hole with the round holes.
3. Insert the "crank" shaft into the round hole in the "base", then thr