Printing with Polycarbonate keeps warping
Adjusting the design may also be able to help limit the amount of warping you get.

One of the major causes of warping is upper layers contracting while cooling when laid down over now-cool(er) lower layers which no longer contract so much but are still thin enough to flex when subject to tension along their upper edge. Insertion of strategically placed gaps in upper layers can reduce the tension such layers are able to apply.

I was printing some long thin beams in ABS. I inserted horizontal-axis holes along the beams (making them look a bit like LEGO Technic beams rather than solid pieces). It did the job for me.