A beginner-friendly breakdown of material types, real-world tradeoffs, and how to pick the right spool for the job.
Walking into a filament shop can feel like staring at a wall of acronyms — PLA, PETG, ABS, TPU, PA-CF… they all look similar on the shelf but behave very differently on the printer. This guide cuts through the noise and explains what each material is actually good at, where it falls short, and when you'd reach for it.
Everything below assumes a standard FDM (fused deposition modeling) printer. If you're running a resin machine, none of this applies — different technology, different materials entirely.
Materials grouped by what they're designed to do, not by chemistry. This is the mental model I wish someone had given me when I started.
Shore Hardness Scale Reference — lower number = softer material. (D scale ≈ A scale + 50)
| Shore D | Shore C | Shore A | Polymer Type |
|---|---|---|---|
| 90 | — | — | Rigid Plastics |
| 86 | — | — | |
| 83 | — | — | |
| 80 | — | — | |
| 77 | — | — | |
| 74 | — | — | |
| 70 | — | — | Semi-Rigid |
| 65 | 95 | — | Soft Elastomers |
| 60 | 93 | 98 | |
| 55 | 89 | 96 | |
| 50 | 80 | 94 | |
| 42 | 70 | 90 | Rubber |
| 38 | 65 | 86 | |
| 35 | 57 | 85 |
What each category actually feels like to print with, and where it shines or struggles.
The default filament for a reason. Prints cool, sticks well, barely warps, and comes in every color imaginable. Made from cornstarch — biodegradable under industrial conditions. Great for prototypes, figurines, and anything that doesn't get hot or take a beating.
The "step up" material. Tougher than PLA, handles heat better, naturally UV-resistant, and food-safe in many grades. The catch: it's stringy, oozes more, and fine details come out softer. It also has that slightly oily sheen some people dislike. Matte variants fix the look.
ABS is the classic tough engineering plastic — strong, heat-resistant, cheap, and sandable/glueable. But it reeks of styrene, warps like crazy, and basically requires an enclosed printer. ASA is ABS's outdoor-rated cousin: same strengths, UV-stable, less yellowing. Both smell bad — vent well.
Rubber-like filaments for gaskets, phone cases, grips, and anything that needs to bend. TPU 95A is the workhorse — prints okay on most machines. Go softer (85A, 83A) and you'll likely need a direct-drive extruder; Bowden setups struggle with the squish. TPE is even softer and stretchier.
Matte, silk, wood-fill, metallic, color-shift, glow-in-the-dark, marble, sparkle — these exist to look cool. Mechanical properties are usually mediocre (wood-fill and metallic can be brittle). Print them for display pieces, cosplay props, and gifts. Don't expect load-bearing performance.
Carbon fiber (CF) and glass fiber (GF) filled filaments trade cosmetic flexibility for stiffness and dimensional stability. CF is usually black only, extremely abrasive (wear a hardened nozzle), and makes parts rigid and light. GF comes in more colors and is slightly less aggressive. Both need drying and hardened nozzles.
PVA dissolves in water — the gold standard for complex support material. PVB dissolves in alcohol and can be vapor-smoothed for a glossy finish. Aero filaments are foamed and ultra-light for RC planes. CMYW sets are for lithophane-style light boxes. None of these are "daily driver" materials.
The seven most common filaments, compared across the specs that actually matter when you're standing in front of the printer.
| Parameter | PLA | PETG | PETG Matte (HF) | ABS | ASA | PLA-CF | PETG-GF |
|---|---|---|---|---|---|---|---|
| Storage Humidity | ≤20% | ≤20% | ≤20% | — | — | ≤20% | ≤20% |
| Pre-Treatment | Drying recommended | Drying required | Drying required | No drying needed | No drying needed | Drying recommended | Drying required |
| Bed Temperature | 50–60°C | 60–70°C | 60–70°C | 80–100°C | 90–110°C | 50–60°C | 60–70°C |
| Printer Setup | Open / Ventilated | Open / Ventilated | Open / Ventilated | Enclosed | Enclosed | Open / Ventilated | Open / Ventilated |
| Strengths | Easy to print, versatile, decent strength, eco-friendly | Good mechanicals, tough, better heat than PLA, UV-stable, ages better | Fast printing speed, matte finish | Good mechanicals, better heat than PETG, inexpensive | Good mechanicals, better heat & UV aging than ABS | Easy to print, versatile, decent strength | Good mechanicals, heat & oil resistant, no oily sheen, less visible layer lines, more colors |
| Weaknesses | Low heat resistance, degrades under strong UV | Harder to print, fine detail suffers | Poor interlayer adhesion | Strong irritating odor, degrades under strong UV | Strong irritating odor, relatively expensive | Unremarkable all-around, very few color options | Relatively expensive |
| Best For | Your default choice. Start here. | When you need more heat resistance and toughness than PLA | Not recommended — pick PETG-GF if you want a matte look | Durability, chemical resistance, mechanical parts | Outdoor use, UV exposure | When you need higher hardness / stiffness | When you want matte PETG with better properties |
If a manufacturer won't give you these documents, that's a red flag. Here's what to ask for and why it matters.
Every legitimate filament brand publishes a TDS. It's the spec sheet for the material, and it tells you exactly what you're buying instead of relying on marketing copy. If a brand doesn't have one publicly available, ask for it — or buy from someone who does.
A proper TDS covers: