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My buddy has a cold plunge and this filter started cracking. After looking at it you can tell it's definitely 3d printed (and well)
On the left you can see my first attempt. I just cut rectangular holes in CAD and it's pretty close but not pretty. Printed in PETG on a K1 Max
Is there a way to do this in the slicer instead? I played around with 0 walls and different infill types but that didn't work out
Ditching the PETG would probably go a long way. Try it in ABS or even PLA and you'll have better shape definition and a whole lot less stringing.
Rather than reproducing the pattern in the original wholesale, you could also consider stealing the idea from e.g. this, which has a "mesh" outer wall that's a continuous loop and thus doesn't require a zillion retractions every time there's a gap.
Exactly, print it in PLA and see if it's a print or a design problem.