Not sure if this has been mentioned before specifically regarding the proof grade medium clear acrylic. With the 2 sheets that were sent out with my GF there is a .007" difference between the 2 sheets.
I guess in hind sight I will have to measure every since piece and design a new cut file for every singe piece. Just wish there was more consistency in the product. i went through and designed and tested on one sheet and cut out a few finished pieces with an accurate friction fit and then cut a few more on the next sheet and they just fell apart. luckily I only wasted ~1/3 of the sheet in this error.