Most outdoor prints fail for one reason: UV and heat. QBL ASA is the material you reach for when the part has to stay outside and keep working — subfloor vent fittings, greenhouse hardware, roof and gutter brackets, anything living in Australian sun. It holds shape to around 100 °C, resists chalking and embrittlement under UV, and takes moisture in its stride. It is also the most demanding filament we sell to print, and the one that most needs a properly ventilated setup — read the safety note below before you buy.
Before you buy: ASA needs an enclosure and extraction
ASA is a styrene-based material, like ABS. Printing it releases styrene and other volatile organic compounds along with ultrafine particles, at substantially higher levels than PLA. This is not a smell-preference issue — it is the reason health authorities treat styrene-based filaments differently from PLA.
US workplace-safety agency NIOSH recommends running printers inside an enclosure with local exhaust ventilation ducted outdoors, and choosing lower-emission filaments where you can. In practice, for ASA that means:
- Print in an enclosed printer — needed for print quality anyway, and it is what makes extraction possible
- Vent the enclosure outside, not into the room
- Do not run it in a bedroom, a small sealed study, or any room where someone sleeps or sits all day
- Run the extraction for several minutes after the print finishes, before you open the door — an enclosure holds everything in until you release it
- Keep children and pets out of the room while it prints
If you cannot vent outdoors, print PETG-HF instead and accept the shorter outdoor life, or sort the ventilation first. We would rather sell you the cheaper roll than have you print this one in a bedroom. The S4 Fume Extraction Kit is the setup we use on our own printers for ASA and ABS.
Why ASA and not PLA or PETG
PLA is the wrong material the moment a part goes outside. UV makes it brittle and chalky within a season, and it softens around 53 °C — a dark part in direct sun or a bracket in a hot shed will reach that. PETG survives moisture well and handles more heat, but its UV resistance is moderate rather than good, so it fades and weakens over long exposure.
ASA was developed as the weather-resistant answer to ABS, and UV stability is its defining property rather than an added claim. Heat deflection around 100 °C, low water absorption at about 0.45%, and enough toughness to take vibration and impact without cracking. It is the material you choose when you do not want to reprint the part every season.
What it is worth printing in
Ventilation and airflow
- Subfloor vent fittings and adapters
- Duct reducers, collars and wall-port surrounds
- Fan brackets, shrouds and airflow guides
- Enclosure exhaust ports
Garden and outdoor
- Greenhouse hardware and custom fixtures
- Trellis clips, vine supports and plant clips
- Pot feet, risers and drainage spacers
- Hose guides, irrigation mounts, gutter clips
A note on the ventilation parts: those are the ones we print ourselves, which is how this filament ended up in the range in the first place.
Printing notes
ASA is not beginner filament, and that is intentional — the properties that make it survive outdoors are the same ones that make it shrink and warp if the print cools unevenly. If you are comfortable with ABS or PETG it will feel familiar. Once dialled in it is consistent and repeatable.
- Enclosure required in practice — draughts cause warping and layer splitting, and the enclosure is what makes extraction work
- Minimal part cooling — 10–35%; too much fan is the most common cause of a failed ASA print
- Hot bed and a clean surface — around 100 °C, with adhesive if your plate is glass or smooth PEI
- Keep it dry — it ships vacuum sealed with desiccant; reseal it between jobs rather than leaving it on the printer for weeks
Specifications
| Material | ASA (acrylonitrile styrene acrylate) |
| Diameter | 1.75 mm |
| Spool weight | 1 kg |
| Density | 1.05 g/cm³ |
| Nozzle temperature | 255–265 °C |
| Bed temperature | ~100 °C |
| Part cooling fan | 10–35% |
| Tensile strength | ~37 MPa |
| Flexural strength | ~65 MPa |
| Heat deflection temperature | ~100 °C |
| Water absorption | ~0.45% |
| UV resistance | Excellent |
| Spool | Reusable PC+ABS — 200 mm outer diameter, 66.8 mm wide, 55 mm centre hole |
| Packaging | Vacuum sealed with desiccant |
| Printer compatibility | Bambu Lab X1 and P1 series, AMS, and any 1.75 mm machine with an enclosure |
| Ventilation | Enclosure with extraction vented outdoors — see the safety note above |
FAQ
Is ASA safe to print at home?
With an enclosure and extraction vented outside, it is a normal material to work with and plenty of people run it at home. Without those, we would not recommend it. Printing ASA releases styrene and other VOCs plus ultrafine particles, an enclosed printer concentrates them, and a small unventilated room gives them nowhere to go. The fix is well understood and not expensive — it is just not optional. If your setup cannot vent outdoors today, buy PETG-HF for now.
Is an air purifier or a carbon filter enough instead of venting outside?
Not equivalent. A carbon filter adsorbs odour and some VOCs but does nothing for ultrafine particles; a HEPA unit captures particles but not gases. Venting outdoors removes both from the room in one move, which is why it is the recommended control. A filtered recirculating setup is better than nothing if venting is genuinely impossible, but treat it as a compromise.
Can I print it on an open-frame printer?
Technically sometimes, practically no. Without an enclosure you will fight warping and layer splitting on anything larger than a small part, and you lose the containment that makes extraction work. An open machine printing ASA puts emissions straight into the room. Enclose the printer first.
ASA or PETG for a part in my grow tent?
PETG-HF for anything inside the tent — it handles the warmth and humidity, and it is far easier to print. ASA is for parts that face real sun or genuine outdoor weather: subfloor vent fittings, greenhouse brackets, anything on a roof or an exterior wall. Paying for ASA to sit in a shaded tent is money you do not need to spend.
How long will an ASA part actually last outdoors?
Years rather than seasons, in normal Australian exposure — which is the entire reason to use it over PLA. We are not going to put a number on it, because service life depends on the part's geometry, wall thickness, colour, load and how much direct sun it takes. What we can say is that UV degradation is the usual killer of outdoor prints, and it is the failure mode ASA is specifically formulated against.
Does it warp as badly as ABS?
It shrinks similarly but is generally better behaved, particularly on layer adhesion. The usual causes of a bad ASA print are too much part cooling and a draught getting into the chamber. Keep the fan at 10–35%, keep the enclosure shut, and it is repeatable.
Will it run in my AMS?
Yes — 1.75 mm on a standard 200 mm reusable spool, 66.8 mm wide with a 55 mm centre hole, so it feeds from the AMS as well as from a dry box or spool holder. Start from your slicer's generic ASA profile and adjust from there.
Safety information here is general guidance drawn from published 3D printing emissions research and public health authority recommendations. It is not a substitute for the material safety data sheet, your printer manufacturer's instructions, or advice appropriate to your own circumstances — particularly in a workplace with occupational health and safety obligations, or if anyone in the household has a respiratory condition.