creality ender 3 - What's causing my PLA prints to lift like this

I'm printing a Soma cube I found on Thingiverse -- it's a puzzle toy I remember from the early 1970s, and the kind of thing that ought to be really easy-peasy to print. Each of the seven pieces is

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creality ender 3 - What's causing my PLA prints to lift like this? - 3D Printing Stack Exchange

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Corners of print keep lifting, any ideas why? : r/ender3

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I've noticed that on some of my prints a random corner starts lifting off the bed mid print? Is this a bed leveling issue or is there anything I should look to

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