PETG vs ASA
PETG prints on any printer with no enclosure and copes with around 75°C; ASA takes around 100°C and is UV-stable, but it needs an enclosed printer and ventilation. On price, PETG is the cheaper today: an established 1 kg spool costs a median of £14.43 per kg, against £20.39 for ASA. We track 1,354 PETG and 186 ASA listings. The cheapest single listings are £5.63 per kg (PETG) and £11.15 per kg (ASA).
| PETG | ASA | |
|---|---|---|
| Listings tracked | 1,354 | 186 |
| Cheapest per kg today | £5.63 | £11.15 |
| Median per kg today 1 kg spools, 100+ reviews |
£14.43 | £20.39 |
| Ease of printing | Fairly easy: a little harder than PLA, and it strings more | Hard: prints like ABS, warping slightly less |
| Heat resistance | Medium: holds up to around 75°C | High: around 100°C, and UV-stable |
| Enclosure needed | No | Yes, plus ventilation |
| Typical uses | Functional parts: brackets, hooks, planters and outdoor fittings | Parts that live outdoors: garden fittings, signs and car trim |
| Main drawback | Strings more than PLA | Same enclosure and ventilation requirements as ABS |
Prices are per kilogram of filament, with multi-spool bundles counted at their full weight, and are read from Amazon UK several times a day. The median is the middle listing among established 1 kg spools (new, with 100 or more reviews): half cost less per kg, half cost more. Little-known listings are left out of it because they are priced far higher and rarely bought; the listing counts and the cheapest figures cover everything we track.
Which should you buy: PETG or ASA?
Buy PETG for outdoor fittings if your printer is open-frame, or if the part will not get hotter than about 75°C: it resists UV and moisture well enough for most garden jobs. Buy ASA when the part faces full sun for years or real heat, such as car trim, and you have an enclosed printer to print it in.
The five cheapest PETG listings today
| Product | Material | Weight | Rating | Price | Per kg | Deal |
|---|---|---|---|---|---|---|
 High-Speed Red PETG 3D Printer Filament 1.75mm, Dimentional Accuracy +/-0.02mm |
PETG | 1 kg | 4.0 out of 5 (1,344 Amazon ratings) | £5.63 | £5.63 | Warehouse |
 3DHojor Basic PETG Filament 1.75mm 1kg*4 Bundle-Clear+Geen+Blue+Orange |
PETG | 4 kg | 4.3 out of 5 (5 Amazon ratings) | £22.60 | £5.65 | 27% below |
 ELEGOO Rapid PETG 3D Printer Filament Bundle 1.75mm Yellow/Green 2KG |
PETG | 2 kg | 4.4 out of 5 (4,640 Amazon ratings) | £12.00 | £6.00 | Warehouse · 45% under new |
 TINMORRY PETG 3D Printer Filament Bundle, PETG-ECO Filament 1.75 mm,Rapid PETG |
PETG | 4 kg | 4.6 out of 5 (9 Amazon ratings) | £24.99 | £6.25 | 24% below |
 3DHoJor Basic PETG Filament 1.75mm 1kg*2 Bundle for 3D Printers-2Pack White |
PETG | 2 kg | 4.4 out of 5 (34 Amazon ratings) | £12.85 | £6.43 | 20% below |
All 1,354 PETG listings, ranked by £/kg
The five cheapest ASA listings today
| Product | Material | Weight | Rating | Price | Per kg | Deal |
|---|---|---|---|---|---|---|
 IEMAI ASA Filament 1.75mm 2KG, Silver Gray/Beige ASA 3D Printer Filament, Heat |
ASA | 2 kg | 4.4 out of 5 (179 Amazon ratings) | £22.30 | £11.15 | Warehouse · 3% under new |
 iSANMATE 12 Pack ASA Filament 1.75mm, Premium Anti-UV Weather Resistant 3D Pri |
ASA | 12 kg | 5.0 out of 5 (2 Amazon ratings) | £139.99 | £11.67 | 6% below |
 iSANMATE ASA Filament 1.75mm Black 1KG, UV & Weather Resistant 3D Printer Fila |
ASA | 1 kg | 4.4 out of 5 (541 Amazon ratings) | £12.04 | £12.04 | 33% below |
 TINMORRY ASA Filament 1.75mm, High UV & Heat Resistant 3D Printer Filament, Du |
ASA | 1 kg | 4.5 out of 5 (206 Amazon ratings) | £13.85 | £13.85 | Like New · 13% under new |
 IEMAI ASA Filament 1.75mm 5KG, Black/White/Brown/Green/Blue, ASA 3D Printer Fi |
ASA | 5 kg | 5.0 out of 5 (10 Amazon ratings) | £70.20 | £14.04 | 6% below |
All 186 ASA listings, ranked by £/kg
Questions people ask
Is PETG or ASA filament cheaper per kilogram in the UK?
PETG filament is cheaper per kilogram than ASA on Amazon UK in November 2026. Among established 1 kg spools (100 or more reviews) tracked by 3D Printer Deals, the median PETG spool costs 14.43 pounds per kilogram across 419 listings, against 20.39 pounds for ASA across 41. The cheapest single listings are 5.63 pounds per kilogram for PETG and 11.15 pounds for ASA.
Is PETG easier to print than ASA?
Yes, PETG is easier to print than ASA. PETG is a little harder to print than PLA and strings more, but it runs on any printer. ASA prints like ABS, warping slightly less, and still needs an enclosed printer.
Which copes better with heat, PETG or ASA filament?
ASA copes better with heat than PETG. PETG holds up to around 75°C. ASA holds its shape to around 100°C and is UV-stable.
Do you need an enclosed 3D printer for PETG or ASA?
Only ASA of the two calls for an enclosed 3D printer. PETG does not need an enclosure. ASA needs an enclosed printer and ventilation.
Guides
-
Enclosed vs open-frame 3D printers: do you need an enclosure?
An enclosure matters enormously for ABS and ASA and barely at all for PLA. What a printer box really does for warping, fumes, noise and safety, and when an open frame is the better choice.
-
Strongest 3D printer filament: types compared
Polycarbonate and nylon are the strongest common 3D printer filaments, but strong means four different things. Which filament type to pick for stiffness, impact, heat and layer bonding.