Warping of first filament layers
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Hello, I'm new to printing and have been having trouble with my Ender 3. My first layers I have been putting down are bulging upwards towards the middle of lines and I have not found any forums or help sites that address this specifically. I've only noticed it while attempting to print larger objects. I've re-leveled the plate and have cleaned it several times and it appears to keep happening. Any help with this would be great!
 