Make sure your calibration sheet is printing at its actual size. I’ve helped quite a few people since the update, and many are running into the same issue—their printer is set to print at 100% scale instead of true size. Also, double‑check your paper size settings. If you’re using A4, ensure both IdeaStudio and your printer are set to A4. If you’re using Letter, both should be set to Letter.
I have a print then cut calibration guide here which might help you as well. Let me know how you go, and we can trouble shoot together.