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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Any advice why my brim is lifting? I've played with settings and have leveled a few times. Every time this keeps happening and my print will become loose about halfway through, leaving

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Why is my print lifting in the right side? This print is supposed to be perfectly symmetrical. The left side looks great! Any suggestions as to what could be causing this???

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