"Inside the doughnut" optical illusion (no ams!)

I am round, yet I am not, A shape that fools, a twist in thought. Step inside, if you dare, But don’t expect a pastry there!

What’s inside? A space unclaimed, An empty hole that plays a game. Look again—your eyes may fight, For what seems wrong just feels so right.

A feast for sight, a trick well spun, A doughnut’s form—yet I am none. 

At 0.08mm layer height (the height of the the print profile) you can pause the print at layer 6 and manually switch the filament to achieve the same effect without a ams, or just use the print profile included:)