ABS / ASA
Heat-proof, impact-tough, built for the garage and the outdoors.
ABS and ASA are the classic engineering-plastic pair — the same family as LEGO bricks and automotive trim. ABS is the workhorse for heat and impact; ASA is its UV-stable sibling, formulated to survive years outdoors without yellowing or turning brittle. Both need real environmental control to print well: a draft-free space and, ideally, an enclosure.
ASA is ABS built for the outdoors
Both print hot and want a warm, closed chamber. ASA keeps its colour and strength in sunlight, where ABS turns yellow and brittle.
See the Panda Breath →Starting points, not gospel — always check the specific spool's spec sheet or your slicer's built-in profile first.
Needs a controlled, draft-free environment — one of the least forgiving materials here for beginners.
Strong and impact-resistant, especially ABS.
Stays rigid to roughly 90–100°C — well past PLA and PETG; fiber-reinforced nylon goes higher.
Some give under impact, not a bendable material.
ASA specifically is built for years of outdoor exposure; plain ABS is not.
ABS (acrylonitrile butadiene styrene) is chosen for one property above all: heat resistance. Parts stay rigid well past where PLA or PETG would sag, and it's tough enough to survive drops and knocks — which is why it shows up in car interiors, power tool housings, and enclosures. It also responds to acetone vapor, which can smooth layer lines into a near-injection-molded finish.
ASA is the same backbone with a UV stabilizer added, trading a small amount of impact strength for genuine outdoor life — mailbox brackets, garden fixtures, or anything that sits in sun for months. ABS left outdoors will yellow and go brittle; ASA is the fix.
Both shrink noticeably as they cool, so an open, drafty room is the main enemy: without enclosed, even heat, corners lift off the plate and layers can split.
Same base chemistry, different additive: ASA includes a UV stabilizer so it survives sunlight and outdoor weather for years without yellowing or going brittle. ABS doesn't — use it indoors only.
Yes, for consistent results. Both shrink noticeably as they cool, and any draft causes corners to lift or layers to split. A draft-free, warm space is the minimum; a heated enclosure is better.
Yes — acetone vapor melts the surface just enough to blend layer lines into a smooth, glossy finish, and it works on both ABS and ASA. Do it in a ventilated space, away from any flame or heat source.
ASA, always. Plain ABS left in the sun yellows and turns brittle within months.
