For some reason if I print using tree supports, some of the trees are not bonding to the build plate. The actual model is completely stuck down so it can not be a dirty build plate. I have also rotated the same model and moved it around the build plate but still have the same problem.
I’m not sure if this is relevant but this only started happening today after I updated the A1 firmware.
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I’ve had the same issue on my A1 mini. It was having the problem in the same area in multiple prints it seemed like. This late time it happened, even though I thought the build plate was clean, I washed it a few times, performed a calibration test on it, and then it worked fine. Not sure if that’d help in your case or not though.