Hi,
the suggestions of @geert_2 are very sophisticated and always worth to be thought of.
But you could just use "make overhang printable" in the "experimental" section in Cura. This will lead to a 45° "ramp" at the underside of the overhanging ring and making support obsolete. Just try and refer to preview.
Regards
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geert_2 557
If you could redesign the overhanging rings to be at 45° or 60°, instead of 0° (where 0° is horizontal and 90° is vertical), they could print without supports. I don't know that machine, so I don't know if these rings are functionally required or not? Or if they could do with a shallower angle? That would seem the best option, if functionally possible, since you don't need supports then.
If you do need the rings at 0°, and thus do want supports, but you don't want them to go all the way down, you could also design custom free hanging supports, like I did in these models. But test that on a small model first, because it will require some fine-tuning. They can easily be cut-off without doing much damage to the model, due to their tiny connection strands. Usually I make the connection strands ca. 0.5mm wide, 1mm long, and 0.2mm high (=2 layers of 0.1mm). In the bridge below they do touch the bridge's side panels. But in the slider-housing they are totally free-hanging, and are kept in place by the stringing of the filament, which makes them really easy to remove. But as said: test this on small models; it may require fine-tuning.
Further, acetone-smoothing the model might also be an option, after sanding to remove the biggest defects: that should fill the gaps and create a nice gloss.
Apart from that, ABS is known to cause underextrusion problems, because its extrusion temp is very close to its decomposition temp, causing it to degrade in the nozzle and partially clog it, if I understood that well. That could also be a reason for temporary gaps in the side.
I am not familiar with high-temp polyesters, so I can't give much recommendations about using them as alternative materials. Maybe other people here can? Standard PET probably won't go high enough, I think ca. 80°C?
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