The marvin is not an easy print
And the blue PLA you receive with the printer is not the best filament too.
You settings seem good to me, what i would do is reduce the infill (no need for 50%) you can reduce to 20% or something like that (i'm not sure but it can maybe be printed without infill?
Except that you can maybe print two at once to let it cool better and position the marvins so that the right fan cools the one that's not being printed?
The right ear looks bad because it's not cooled well (the right fan is too far from the print).
Our marvin works as an engineer
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