I think part of the problem is also these objects are really small. Your medallion is only 2x2cm The small letters are most likely smaller than your nozzle size which is why they aren't slicing correctly. Any details smaller than 0.5mm will generally not come out as intended.
You would have better luck with that medallion standing up with supports since detail is greater on the vertical axis.
As dim3ntioneer has suggested the firefly ship probably has some bad Geo, but also could be suffering from being too small as well. Can't see from that angle but it looks to be only about 2x4x4cm. Same limitation with the nozzle size.
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Dim3nsioneer 557
Check these models in the x-ray view. If there is something displayed in red, it's a problem with the model, most probably a so-called non-manifold surface. In most cases there is just a hole somewhere in the model.
You also can open the expert settings and play around with the four 'fix horrible' settings. Personally, I would check the 'fix horrible B' setting first...
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