Does ASA need an enclosed printer?

Yes, for reliable results. ASA shrinks as it cools, so an enclosure keeps the chamber warm and stops large parts from warping. An open-frame printer will struggle with anything bigger than a small part.

How is ASA different from ABS?

ASA is closely related to ABS but resists UV and weathering much better, so it keeps its color and strength outdoors. Print temperatures and settings are nearly the same.

What hot end temperature does it need?

Plan on roughly 250-270°C at the nozzle and 90-110°C on the bed. A hardened or all-metal hot end is the safe choice, and part cooling should stay low.

Does it fit a standard 1.75 mm printer?

Yes, it is 1.75 mm filament on a 1 kg spool with a standard hub, so it fits common spool holders. Check that your printer's hot end and enclosure can handle the temperatures first.

Can ASA prints be smoothed?

Yes. Acetone vapor smoothing works on ASA much as it does on ABS, giving glossy surfaces and hiding layer lines. Do it outdoors or with strong ventilation.

Is it good for car parts?

It is one of the better choices for interior and exterior car trim because it handles heat and sunlight. Avoid parts that see very high engine-bay temperatures.