Filament guideRegular PLA is easy to print and looks great, but drop it and it can crack. That's why shelves are full of spools labeled "PLA+" or "Tough PLA." Here's what those labels mean, and what Bambu Lab's PLA Tough+ actually delivers in Bambu's tests.
Quick answer
The short answer
"PLA+" is a marketing term, not a standard. Different brands use it for PLA with added modifiers that make it less brittle, and the results vary from spool to spool and brand to brand.
PLA Tough+ is Bambu's toughened PLA, with published test numbers. Bambu rates its toughness on par with ABS and its layer adhesion at up to 2× standard PLA. It's for parts that take knocks, bends and repeated use.
01
What does "PLA+" mean?
Standard PLA is stiff but brittle. Manufacturers blend in impact modifiers to make it bend before it breaks. Anything sold that way can be called PLA+, PLA Pro or Tough PLA.
Because there's no shared definition, one brand's PLA+ can be much tougher than another's. The only way to compare is with test data. That's where Bambu's numbers help.
02
How PLA Tough+ compares
Bambu tests PLA Tough+ against its own PLA Basic and ABS. Impact strength measures how well a part survives a sharp hit. The "Z" figure tests the bond between layers, which is where printed parts usually fail.
| Bambu's test | PLA Basic | PLA Tough+ | ABS |
|---|---|---|---|
| Impact strength (XY) | 26.6 kJ/m² | 80.6 kJ/m² | 39.3 kJ/m² |
| Layer adhesion, impact (Z) | 13.8 kJ/m² | 25.9 kJ/m² | 7.4 kJ/m² |
| Bending strength (XY) | 76 MPa | 65 MPa | 62 MPa |
| Bending modulus (stiffness) | 2,750 MPa | 2,140 MPa | 1,880 MPa |
| Heat deflection temperature | 57°C (135°F) | 61°C (142°F) | 87°C (189°F) |
The pattern is clear. PLA Tough+ is about three times as impact resistant as PLA Basic in this test, and a bit less stiff. It flexes a little instead of snapping. It does not match ABS on heat.
03
What PLA Tough+ is good for
- Clips, latches, springs and snap-fit connectors
- Functional prototypes that get handled and tested
- RC car parts and model plane parts
- Durable tools, jigs and fixtures
- Cosplay armor and props that get worn, bumped and packed
- Kids' items and anything likely to be dropped
04
Limits to know
- Heat is still PLA-level. At 61°C (142°F), it's not for car interiors or hot outdoor use. For that, see ABS and ASA or PETG.
- Less rigid. If a part must stay perfectly stiff, PLA-CF is the better fit.
- Function over finish. For pure display pieces, PLA Matte or silk PLA will look better.
05
Tips for designing tough parts
Orientation matters as much as material. Parts are weakest between layers, so we print clips and hooks so the stress runs along the layers, not across them. Generous fillets at inside corners and thicker walls help too.
06
PLA Tough+ at IMPRESO
We print PLA Tough+ in-house in our Ridgewood, Queens studio. Tell us how the piece will be used, what it needs to survive and where it will live, and we'll recommend the right material. Every job is quoted individually.
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Send us your file, a sketch or just the idea, and how the piece will be used. We'll recommend a material and quote it.
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