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Your blob is too larger. Explicitly set the number of plot_points to be smaller:

parametric_plot3d( [b*t, -a*t, f(b*t,-a*t)], [t,-e,e], color="yellow", size=15, plot_points=200 )

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Your blob is too larger. large. Explicitly set the number of plot_points to be smaller:

parametric_plot3d( [b*t, -a*t, f(b*t,-a*t)], [t,-e,e], color="yellow", size=15, plot_points=200 )