The finish of printed par can vary depending on the material you are using. It can also vary depending on the color of your filament, as dies used to color the plastic is changing the plastic characteristics, you may encounter some differences when switching colors. If you cannot print your part in ABS, try with PLA. The printing behavior is completely different as well as the finish.
The shape of your object must be compatible with the FFF printing technology.Your object must have the less possible surface in the void and the climbing angles must be higher than 45°. The machine will be able to print some parts in the void up to 2 to 3mm max without support. After that, for PLA the cooling capacity and it’s orientation will greatly impact the capacity to print overhangs
Check that the size of your object is compatible with the size of your nozzle. For example a 0.8mm nozzle will be limited when printed very small detailed parts. It will be more effective when printing very big parts!
In the opposite a 0.4mm nozzle will be more likely to give you nice detailed object, but will be very slow at printing very big objects, so choose your nozzle carefully