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So it only happens with large objects that are close to the left side of the build plate. The top layer is AFU. The only thing I can think of is that is where the fan is, on the left side. But this print is only about a half inch tall, so the fan is never blowing directly on the print because the build plate is still well above the level of the fan. It is 10x6 in size but only a half inch tall. The rest of the top came out fine but the left edge is trash. Happened with multiple filaments. I even tried drying the filaments to see if that was it but no luck.

Any ideas?

So it only happens with large objects that are close to the left side of the build plate. The top layer is AFU. The only thing I can think of is that is where the fan is, on the left side. But this print is only about a half inch tall, so the fan is never blowing directly on the print because the build plate is still well above the level of the fan. It is 10x6 in size but only a half inch tall. The rest of the top came out fine but the left edge is trash. Happened with multiple filaments. I even tried drying the filaments to see if that was it but no luck. Any ideas?

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[–] • 1 pt

The physical qualities at the bed are at play and it could be cooler there than the rest of the bed, and the part may be curling upwards slightly there. Inspect the part for flatness on the bed side. If that is the case, consider rasing the bed temperature to compensate. Also cleaning the bed with ipa wouldn't hurt. Consider adding a raft, a brim, or using a gluestick. Modifying the part to have chamfers on the bedside can help with the curling.

If that doesn't work, tram and relevel the bed, and check your extrusion and flow rates. Verify bed adhesion.

If none of this works, you can proabably can work around with more soild top layers in the slicer.

[–] • 0 pt

It is not peeling up off the bed at all. Plus I monitored the printing progress and it looked great right up until the top layer and they it went to shit.

On the first try I had 4 top layers, 5 on the second try. I ran a calibration so I will give it another shot.