Little Rainbow Stacker

This is a little revision of [my earlier stacking rainbow](https://www.thingiverse.com/thing:2381407). It's smaller (slightly more than 4" wide with 11 or 12 arcs, slightly less than 3" with 6). The pieces are still as deep as the original (1.5") so they're pretty stable to stack, but, they're much thinner
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There's very little clearance between these pieces, they shouldn't be snug, but, there should be a close fit. As with the original, the smallest piece is very small- it will not fit in a