Affiliate disclosure: This article contains Amazon affiliate links. If you buy through them, I get a small commission at no extra cost to you. It pays for filament and the occasional crash repair, which there have been several of, thanks for asking.
Right, let’s talk filament. If you’ve already got a printer staring at you and a wing file open in your slicer, the next decision is what to feed the thing. Get this wrong and you end up with a beautifully printed plane that flies like a brick — too heavy, too brittle, or both. Get it right and you’ve got a wing that survives a hard landing and still climbs out under a modest motor. Below are the rolls I keep on the shelf, sorted by what they’re actually for. No hype. Mostly.
Quick aside — if you haven’t picked a wing to print yet, our own Wing Designer tool lets you sketch one in a browser and export it straight to STL. No CAD needed, just sliders for shape, dihedral, and spars. Pair it with a roll of LW-PLA and you’ve got a wing of your own design ready to slice.
1. LW-PLA & Pre-Foamed PLA — The Stuff Wings Are Made Of
This is the category that made 3D printed planes actually viable. Standard PLA is dense — too dense for a 1200mm wing if you want it to fly like an airplane and not a dumbbell with ailerons. LW-PLA (lightweight PLA) uses an active foaming agent that expands inside the hot end, dropping density to roughly 0.54 g/cm³ when tuned right. You print at lower flow (around 45–55%) and let the material puff up to fill the walls. Done well, you get parts that weigh less than half what regular PLA would, with a matte surface that takes paint nicely.
Worth knowing up front: LW-PLA is fussier than regular PLA. Retraction barely works because the filament keeps foaming after the nozzle moves. Stringing is normal. Dial it in once for your printer, save the profile, and don’t fight it.
SUNLU LW-PLA
SUNLU’s lightweight PLA is the friendliest LW-PLA I’ve used. Their recommended starting profile (190–210°C nozzle, 50–60°C bed, 30–50 mm/s) is genuinely close to what works on most printers, which is unusual for foaming filaments. It’s sold as a 0.8kg spool rather than the more common 1kg, which feels like a slight cheat at first glance until you remember the foam ratio means it goes further than a regular spool of the same weight.
It’s not quite as light at peak foaming as the eSUN, but it’s more forgiving if you don’t want to spend an evening tuning. If this is your first LW-PLA roll, this is a fine place to start.
Polymaker PolyLite LW-PLA
Polymaker’s contribution to the foamed filament game. Tighter dimensional tolerance than the budget rolls, properly wound spools that don’t tangle when you’re loading at 11pm before a Saturday flying session, and better consistency between batches. It comes on 0.8kg spools, same as SUNLU.
The “premium” pick is honestly more about predictability than peak performance. If you’re building a scale model where every wall thickness matters, the consistency saves you re-tuning every roll. For a sport plane that’s going to take some lumps, the cheaper rolls are fine. Spend up if you’re building something you actually care about.
Overture Air PLA (Pre-Foamed Alternative)
This is the one I always mention when somebody is scared off by LW-PLA tuning. Overture Air PLA is pre-foamed — the foaming happens during filament manufacture, not in your hot end. That means you print it with mostly normal PLA settings, no flow tricks, no temperature dance. Density lands around 0.9 g/cm³, which is roughly 20% lighter than standard PLA. So you don’t get LW-PLA’s dramatic weight savings, but you also don’t get LW-PLA’s headaches.
For a beginner’s first printed plane, or for control surfaces and non-structural parts where you want some weight savings without a fresh tuning project, this is a reasonable middle ground. It’s not as light as proper LW-PLA — be honest with yourself about that before you order it expecting miracles.
2. Standard PLA & PLA+ — For The Bits That Don’t Fly
Not everything on a printed plane wants to be foamed. Control horns, servo trays, motor box reinforcements, cockpit interiors, hatch latches — these want to be stiff and dimensionally accurate, not feathery. Regular PLA (or PLA+ for a bit more toughness) is what you reach for. It also helps to have a roll on hand for printing test pieces and tuning towers without burning through your expensive LW-PLA.
Hatchbox PLA Black
Hatchbox is the workshop staple. There’s almost nothing exciting to say about it, which is the highest compliment. It loads, it prints, it sticks, it doesn’t string much, the diameter is consistent, and a 1kg spool is cheap enough that I don’t feel guilty using it for benchies and bracket prototypes. For 3D printed plane work, I keep a roll for printing servo horns, control horn bases, hatch clips, and electronics trays where weight matters less than dimensional accuracy.
The slightly less polished bit: Hatchbox PLA is fine PLA, not premium PLA. If you want printed parts with absolutely zero visible layer lines straight off the printer, look at a matte or PLA+ from one of the boutique brands. For utility parts on a plane, who cares. Sand and prime later.
SUNLU PLA Plus
PLA+ (or PLA Pro, or PLA PRO, depending which marketing department got there first) is a tougher formulation of regular PLA. It cracks less, takes more abuse, and is what I use for mid-stress printed parts that aren’t quite earning the upgrade to PETG. Motor mount reinforcements, landing gear blocks on lighter planes, hatch hinges — things that get stressed but aren’t life-or-death structural.
SUNLU’s PLA Plus is consistently good and reasonably priced. Neatly wound spools, vacuum-sealed with desiccant, 1.75mm with ±0.02mm tolerance. Print it slightly hotter than regular PLA (210–235°C) and it behaves itself.
3. PETG — For The Bits That Take A Hit
PETG is what you reach for when standard PLA isn’t tough enough but you don’t want to mess with ABS in a non-enclosed printer. Higher impact resistance, better heat tolerance, less brittle. On a printed plane, PETG belongs in motor mounts, landing gear, firewall reinforcements, and skid plates — anywhere the part needs to absorb impact without snapping.
Heads up: PETG is stringier than PLA, prints hotter (around 230–250°C), and is mildly hygroscopic, so dry the filament if it’s been sitting open. None of that is dealbreaking, but it’s not quite as plug-and-play as PLA.
Overture PETG Black
Overture’s PETG is what I default to for printed plane structural bits. Vacuum-sealed packaging, ±0.02mm dimensional tolerance, decent layer adhesion, and it doesn’t fight you on a stock printer setup. I’ve had it survive crashes that would have shattered a PLA equivalent. Print it at 230–260°C with a 65–70°C bed and you’re fine.
One small consideration — PETG can be a bit too sticky on smooth PEI build plates, occasionally taking small chunks of the surface with it when prints come off. A thin glue stick layer or a textured plate fixes it. Worth knowing before your first print.
Hatchbox PETG Black
Same story as Hatchbox PLA, just in PETG flavor. Reliable, well-priced, gets the job done. The dimensional tolerance is ±0.03mm rather than the ±0.02mm you’ll see on the Overture, but for landing gear and motor brackets you won’t notice. I keep a roll of this around as a backup or for parts where I just need PETG and don’t care which one.
Where it falls a bit short: the color range isn’t as broad as Overture’s. If you’re trying to colour-match a paint scheme, you’re more likely to find what you want at Overture. If you just want black for a hidden internal part, this is fine.
4. TPU — For The Bits That Bend
TPU (thermoplastic polyurethane) is your flexible filament. Print a TPU part and it bends rather than snapping. On a 3D printed plane, TPU is mostly used for nose cones, prop spinners, landing gear skids, and impact-zone pieces that you’d rather have squish than crack. Some builders also print entire wing tips in TPU as cheap insurance against ground loops and tip strikes.
Quick heads-up: TPU prints slow (20–40 mm/s typical), and it really wants a direct-drive extruder. Bowden setups can do it, but it’s painful. If your printer has a Bowden tube and a long path to the nozzle, expect frustration.
SainSmart TPU 95A Black
SainSmart’s 95A TPU is a long-time community favourite for good reason. 95A is a sweet spot of hardness — flexible enough to absorb impact, stiff enough to print without too much drama. Improved bed adhesion, low warping, and consistent diameter (±0.05mm). I use it for nose cones on smaller printed planes and it’s saved more props than I care to count.
Slightly less sparkly: 0.8kg spool rather than the standard 1kg, so the per-gram price isn’t as competitive as it first looks. And it’s still TPU — print slowly and don’t expect 200mm/s miracles even on a fast printer.
Overture TPU 95A Black
Full 1kg spool of 95A TPU, vacuum-sealed, decent diameter tolerance, and it actually prints faster than a lot of TPU rolls if your printer can handle it. Layer adhesion is good, finish is smooth, and it doesn’t string as much as some cheaper TPUs. For nose cones and skids on a printed plane, this is a no-drama choice.
Mild caveat — TPU absorbs moisture faster than basically any other common filament. If you don’t dry it before printing, especially if you live somewhere humid, you’ll get bubbly prints and bad layer lines. A filament dryer isn’t optional for this stuff long-term.
5. Carbon-Fiber-Reinforced PLA & PETG — For The Stiff Bits
Carbon fiber reinforced filament is regular PLA or PETG with chopped carbon fibers mixed in (typically 8–15% by weight). It doesn’t make parts dramatically lighter, but it makes them noticeably stiffer and more dimensionally stable, with a striking matte black finish that hides layer lines. On a printed plane, CF-PLA earns its place in motor box reinforcements, wing root joiners, and any part where flex is the enemy.
One important warning before you order: carbon fiber filament is abrasive. It will eat a brass nozzle faster than you’d believe. Get a hardened steel nozzle (or ruby-tipped if you’re feeling fancy) before you load any CF filament, or budget for a new nozzle every kilo or so.
Polymaker PolyLite PLA-CF
Polymaker’s carbon-fiber PLA contains 8% chopped carbon by weight, prints at standard PLA temperatures (around 220°C nozzle), and produces parts with a clean matte black finish that genuinely looks engineered rather than just printed. Dimensional stability is excellent — almost no warping even on larger parts — and layer adhesion is solid. For wing root reinforcements and structural printed brackets, this is a sensible upgrade over plain PLA.
Worth flagging: it’s based on Polymaker’s matte PolyTerra base material, so the impact strength is actually a hair lower than regular PLA. It’s stiffer, not tougher. If you want stiff-and-tough, you want PETG-CF, not PLA-CF.
SUNLU Carbon Fiber PLA
SUNLU’s PLA-CF is reinforced with 15% carbon fiber — a higher loading than the Polymaker, which translates to slightly more rigidity. Same caveats apply: hardened nozzle required, prints close to regular PLA settings (190–230°C nozzle), and you get a frosted matte finish. It’s also one of the cheaper CF-PLA options on Amazon, which makes it easy to justify keeping a roll on the shelf for the occasional reinforcement print.
The slightly less polished bit: at 15% CF loading it’s noticeably more brittle than 8% versions. Snaps cleaner under sharp impact. Use it where stiffness matters and impact doesn’t.
Comparison Table
| Filament | Type | Best Use On A Printed Plane | Print Difficulty |
|---|---|---|---|
| eSUN ePLA-LW | LW-PLA (foaming) | Wings, fuselage, tail surfaces | Medium (tuning needed) |
| SUNLU LW-PLA | LW-PLA (foaming) | Wings & fuselage, beginner LW build | Medium (forgiving) |
| Polymaker PolyLite LW-PLA | LW-PLA (foaming) | Scale builds where consistency matters | Medium |
| Overture Air PLA | Pre-foamed PLA | First printed plane, control surfaces | Easy |
| Hatchbox PLA Black | Standard PLA | Control horns, servo trays, hatches | Easy |
| SUNLU PLA Plus | PLA+ | Mid-stress brackets, hinges | Easy |
| Overture PETG Black | PETG | Motor mounts, landing gear, firewalls | Medium |
| Hatchbox PETG Black | PETG | Backup PETG, hidden structural parts | Medium |
| SainSmart TPU 95A | TPU (flex) | Nose cones, skids, impact zones | Hard (direct drive preferred) |
| Overture TPU 95A | TPU (flex) | Nose cones, wing tips, prop spinners | Hard (direct drive preferred) |
| Polymaker PolyLite PLA-CF | Carbon-fiber PLA | Wing root reinforcements, brackets | Medium (hardened nozzle) |
| SUNLU Carbon Fiber PLA | Carbon-fiber PLA | Stiff structural parts on a budget | Medium (hardened nozzle) |
What Electronics Will You Need?
Choosing filament is one piece of the puzzle. Most 3D printed planes in the 1000–1500mm range pair their printed airframe with a 2212-class brushless motor, a 30A ESC, a 3S 2200mAh LiPo, and 9g servos for the control surfaces. We’ve covered all of these in detail — see our brushless motors guide, ESC guide, LiPo battery guide, and servo guide for product picks at every wingspan class.
FAQ
What’s the best filament for a 3D printed RC airplane?
For wings, fuselage, and tail surfaces, LW-PLA (lightweight foaming PLA) is the standard answer — eSUN ePLA-LW is the most widely used. For non-foaming structural parts like motor mounts and landing gear, PETG is tougher and more impact-resistant. Most printed planes use a combination of both.
Is LW-PLA strong enough for an RC airplane?
Yes, when designed for it. LW-PLA has good interlayer adhesion when foamed correctly, and printed plane designs (Eclipson, 3DLabPrint, etc.) are engineered around its specific properties. It’s strong in tension along the print direction and sufficient for normal flight loads. It is more impact-fragile than regular PLA, so noses and high-impact areas often use TPU or are reinforced with carbon rod.
Do I need a special printer for LW-PLA?
No. LW-PLA prints on most standard FDM printers including Ender 3, Bambu A1, Prusa Mini, and similar — anything with a 0.4mm nozzle and basic temperature control. You just need to dial in flow rate (around 45–55%) and nozzle temperature (210–270°C depending on brand) once and save the profile. A direct-drive extruder helps but a Bowden setup will work.
What temperature should I print LW-PLA at?
It depends on the brand. eSUN ePLA-LW foams between 210°C and 270°C, with most builders settling around 245–255°C for good foaming. SUNLU LW-PLA is happier lower, at 190–210°C. Polymaker LW-PLA falls in between. Always print a temperature tower with the specific brand to find your sweet spot — the same temperature on different printers can give noticeably different foaming.
Can I just use regular PLA for a printed plane?
You can, but it’ll be heavy. A 1200mm-wingspan plane that weighs 700g in LW-PLA will weigh closer to 1300g in regular PLA, which means higher wing loading, faster stall speeds, and a much less pleasant aircraft to fly. Regular PLA is fine for control horns, servo trays, and small accessories, but the main airframe really should be LW-PLA or pre-foamed PLA if you want it to fly properly.
Related Reading
- Top 5 Websites for 3D Printable Airplane Plans — where to actually get the .stl and .gcode files for these filaments
- Best 3D Printers for Printing RC Airplanes — pair the right filament with the right machine
- Best Finishing & Painting Supplies for 3D Printed Planes — sand, fill, prime, paint
- Best Brushless Motors for RC Airplanes — sizing for printed builds
- Best LiPo Batteries for RC Airplanes — battery selection by wingspan
Closing
That’s the shelf. If you’re building your first 3D printed plane, get a roll of eSUN ePLA-LW or SUNLU LW-PLA for the airframe, a roll of Hatchbox PLA for the small bits, and a roll of Overture PETG for the motor mount and landing gear. That’s about 90% of what most builds need. Add TPU when you want a flexible nose cone, add CF-PLA when you want a stiffer wing root joiner. Don’t overthink it on roll five — overthink it after roll three when you’ve actually flown one.
And dry your filament. Especially the PETG and TPU. I will say this every chance I get because nobody listens until they have a stringy, bubbly mess of a print and finally believe me. Dry it.
Go print a plane. Then crash it. Then print another one. That’s the hobby.
Leave a Reply