ABS

ABS is harder to sand than PLA because of its denser nature. PLA is softer and easier to sand with fine grit sandpaper.

Printing ABS at too high temp causes issues like stringing, sagging, poor surface quality, and toxic fumes. Best temp range is 210-260°C to ensure proper melting without burning.

There are ways to harden your ABS prints after peeling them off the print bed that will drastically improve the durability and appearance of your 3D printed objects. 

As a thermoplastic, it is typically solid when cold but can be heated until soft, such as in a 3D printer. However, 3D printing with ABS is a bit more complex than meets the eye due to its unique properties.