Y-Axis Layer Shift Test Model

When working though y-axis layer shift issues I designed this model to excite my particular failure mode (basically circular shapes seemed more likely cause my printer to fail). Probably won't be effective in all failure scenarios, 'but something to try. For me it failed 100% of the time for what had been a frustratingly intermittent issue previously.

Suggest you align it so the smallest and central ellipses lie along the y-axis, turn the layer height down as far as possible (more layers