Line shift troubleshoot and colour difference

Bambu Lab H2 Series Bambu Lab H2D
1

Hello all,

Please bare with as I am not very experienced in troubleshooting and terminology.

I have recently done a large print that was for a container so a large almost full bed print flat on the heat bed.

My first print had some warping so I cleaned the bed and adjusted the auxiliary fan setting which improved it, although there was still very minimal warping but nothing crazy, but there is the weird shift in layer from near the bottom of the print, it basically from that layer near the bottom bulges out slight in all sides and just continues to print like that which gives it a distinct line, any reason why this might be?

Additionally, I print with Sunlu Pla+ white and around half way one spool ran out and it continued on the second spool and it looks a very different shade of white, I can confirm all setting where the exact same and nothing changed and both were stored in similar conditions, so confused as to why it looks so different?

I use the Bambu labs Pla basic preset for this with 8mm brim and bed set to 60C.

I have had no issues with smaller prints using the generic Bambu labs Pla basic preset

Thank you for your help.

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It’s all pretty straightforward. Any manufacturer (of filament, inks, etc.) may have the same color markings, but different batches may produce different actual colors. Even within a single batch, the spool received at the beginning and end of the batch may differ. Additional components may also differ by a few percent. As a result, you’ll get different behavior with the same settings.
The higher the quality of the manufacturer, the lower the chance of this happening. But it still exists.
The filament’s wetness (how much moisture it has absorbed) can also significantly affect its behavior. This leads to different melting rates and different shades of the final product (for example, different gloss or matte finishes). One spool is dry, while the other isn’t. Or one has been unpacked for a long time, while the other has just been unpacked.

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