My cooling settings are the same as you have shown. But yes, this particular print has two objects printing and this part is the taller part, so the dividing line is where the other part was done. So It does seem clear that the faster printing/less time to cool is the issue on this particular object. I never noticed this before when printing with my Prusa printers, no doubt because they are much slower.
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I’m quite new to the Bambu system. Short of separating the two objects and printing individually, do you have any suggestions for achieving the more glossy finish on the whole model?
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This question as originally stated is pretty far off-topic: asking for product recommendations. We don't give answers of that form on this site.
However, in general PETG is very glossy unless it's been specifically modified to be matte. If you're getting matte-like outcomes, it might be that your temperature is too low for the material and speed. PETG (at least as it's used as a marketing term) is not a single material but a whole class of materials with different thermal properties, so some brands need to be printed hotter than others. Many materials come out "matte" (and also have layer adhesion and brittleness properties) if the temperature you're using is only borderline for the speed you're printing them at. If you can't go higher temperature on your printer, you could try slowing down and see if that gets a surface more to your liking.
Now, as for specific product recommendations, we can't do that, but I can recommend the Filament Librarian's FilamentColors site as a way to get real photos of a huge library of real materials, which might help you select one with the surface sheen you want.
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