First Grade. Please use the Whamtam installation video as there are NO instructions. Your printer wasn't originally designed to use them so you need to be careful, especially if this is your first time setting up a printer with a cymbal, make sure you line up the flex plate with your build plate and watch as you do Lower your build plate. Washing only fits the back of the printer, but yours may be different. If you have adhesion issues like me, check the level first. If that doesn't work, use 300 grit sandpaper on one side of the board. Since then I have been 100% successful. I would give it the highest rating other than 1 - no instructions and 2 - I had to permanently sand down the panel. adhesion
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