The short answer. "PLA+" and "PLA Pro" aren't standards. No rule says what has to be in them, so two spools with the same label can be very different plastics. "Tough PLA" is closer to a real category: PLA that has been engineered to absorb impact instead of snapping. The best way to know what you're buying is to ask which resin it's made from and look at the data sheet, not the name on the box.
We make two PLAs, and we name the resin in both: Standard PLA+ (NatureWorks Ingeo 4043D) and Tough Pro PLA+ (NatureWorks Ingeo 3D870). Here's how the names line up and how to choose.
PLA, PLA+, PLA Pro and Tough PLA at a glance
| What the name usually means | What to check | |
|---|---|---|
| PLA | Standard polylactic acid, the most common 3D printing plastic. Easy to print, stiff, brittle on impact. | Resin grade and print temperature range |
| PLA+ | A marketing name. Can be plain PLA, PLA with additives, or something better. There's no definition. | Resin grade, impact data, whether the brand will tell you what's in it |
| PLA Pro | Also a marketing name, used for the same range of materials as PLA+. | Same as PLA+ |
| Tough PLA | PLA that's been modified for impact toughness, usually an engineered grade made for 3D printing. | Impact test results and heat resistance, as printed and annealed |
Why "PLA+" and "PLA Pro" don't tell you much
Early in 3D printing, the industry settled on one standard PLA grade because it printed well. It's still sold today under a long list of names, including PLA+, PLA Pro and PLA Advanced, even when the plastic inside is the same. Some brands do add modifiers for toughness or flow, but the label alone won't tell you which you're getting.
That's why we put the resin grade on our product pages. NatureWorks Ingeo 4043D and Ingeo 3D870 are published grades with known properties, so you can look them up instead of taking our word for it.
What makes a PLA "tough"
Standard PLA is stiff and strong, but it's brittle: drop a thin part and it can crack or shatter. A tough PLA trades a little stiffness for the ability to absorb impact. Tough Pro PLA+ is made from Ingeo 3D870, a grade NatureWorks designed for 3D printing, and in our drop test it has 8.8x the impact toughness of our Standard PLA+ (Bambu Lab X1C, 0.2 mm layers, not annealed, 1 kg standard weight).
It also handles heat better once it's annealed. As printed, both of our PLAs soften around 55-60 °C. Tough Pro PLA+ can be annealed in an oven at 110-120 °C to hold 75-85 °C. Standard PLA+ can't be annealed for heat resistance.
Standard PLA+ vs Tough Pro PLA+
| Standard PLA+ | Tough Pro PLA+ | |
|---|---|---|
| Resin | 100% NatureWorks Ingeo 4043D | NatureWorks Ingeo 3D870 |
| Impact toughness | Baseline | 8.8x Standard PLA+ in our drop test |
| Heat resistance | Softens around 55-60 °C; can't be annealed | Softens around 55-60 °C as printed; 75-85 °C annealed |
| Nozzle temperature | 220-250 °C | 230-250 °C |
| Bed | 0-60 °C | 0-60 °C |
| Enclosure | No | No |
| Best for | Prototypes, models, display pieces, organizers, multi-color prints | Functional parts that take a hit: brackets, clips, enclosures, tools, cosplay armor |
| Price, 1 kg spool | $25.95 | $32.95 |
Both are made in Fargo, North Dakota, with no fillers, and both come on 1 kg spools that fit the Bambu Lab AMS.
What happened to Workday PLA and Pro PLA?
If you've bought from us for a while, you may remember three PLAs: Standard, Workday and Pro. Workday PLA is no longer made. Pro PLA is now called Tough Pro PLA+; same formulation, new name. Standard PLA+ is still Standard PLA+.
How to tell what you're buying from any brand
- Ask for the resin grade. A brand that knows what's in its filament can tell you.
- Look for impact data, not adjectives. "Tougher" and "stronger" mean little without a test and a number.
- Check the print temperature. Engineered tough PLAs usually print hotter than standard PLA. If a "tough" PLA prints at 200 °C, be curious.
- Read the data sheet. Heat resistance as printed and annealed, tensile strength and impact values should all be there.
When to skip PLA and use Pro PCTG
Even a tough PLA is still a PLA. If the part lives outdoors, sits in a hot car, touches oils or cleaners, or needs maximum toughness, use Pro PCTG. We compare the two in PCTG vs Tough PLA+: Which Filament Should You Print With?
FAQ
Is PLA+ stronger than PLA?
Sometimes. Because "PLA+" has no definition, some PLA+ is just standard PLA. Check the brand's data sheet.
Is PLA Pro the same as PLA+?
Usually they're used for the same kinds of material. Neither name guarantees anything on its own.
What is the strongest PLA filament?
For impact, an engineered tough PLA. Tough Pro PLA+ has 8.8x the impact toughness of our Standard PLA+ in our drop test.
Do I need a different printer profile for tough PLA?
Start from a PLA profile but print hotter, at 230-250 °C. A generic PLA profile usually runs too cool. Our Tough Pro PLA+ print profiles cover Bambu Lab, Prusa and more.
Written by John Schneider, founder of 3D-Fuel. October 2026.
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