I bought a couple of these sheets off Amazon last month as an addition to the stock PEI spring steel sheets I have from Prusa. These ones are thicker than the stock, and slightly textured on the surface, and I've been using them on one of the Mk 2.5's. Yesterday and today I printed some of the microphone stand collars on it using Matterhackers NylonG filament. The results turned out nicely:
Compared to the stock sheets, the couple of batches that I've printed using these sheets have experienced minimal to no warping, and have been extremely easy to remove from the bed once its cooled. The live Z could come up a little bit more, as there is some "elephants foot" on the part, but this won't affect the final performance of the part.
