What is the strongest 3D printing material?

For our FDM service it is PA-CF, which is nylon with short carbon fibers mixed in. It pulls to about 80 MPa and holds shape to about 140 C, well past anything else we print. The fibers make it stiff, so parts stay rigid under a load that would bend PETG.

Is PLA or PETG stronger?

Their tensile numbers are nearly identical, near 50 MPa each, so the chart says it is a tie. In a real part PETG wins clearly. It gives a little before it breaks, so a knock bends it instead of cracking a layer seam. It also holds shape to 73 C against PLA's 57 C, and it sags far less under steady load.

Is PA-CF stronger than ABS?

Yes, by a wide margin on both counts that matter. PA-CF pulls to about 80 MPa against ABS at about 40 MPa. It also holds shape to about 140 C against 98 C. ABS still has two advantages: it takes paint and solvent glue better, and it costs less.

Why is PLA ranked last for real use?

Three reasons, and none of them show up in the tensile number. It is brittle, so it cracks on impact instead of bending. It softens at 57 C, which a sunny window can reach. And it creeps worst of the group, meaning it slowly sags under a load that never lets up. It is still a great pick for visual parts.

Does a stronger material always make a stronger part?

No, and this trips up more buyers than any other point here. An FDM part is weakest between its layers. Print it the wrong way around and you get a seam right where it bends. A well designed PETG part will beat a badly designed PA-CF part. Fix the print angle, the gussets, and the wall thickness first.

Which material should I pick for an outdoor load-bearing part?

PETG for most of them, PA-CF when it must not flex. Both handle sun and rain far better than PLA, which softens at 57 C and gets brittle in sunlight. PA-CF adds stiffness and a 140 C heat limit. That matters if the part sits in direct sun.

How do I get a price for the strongest option?

PA-CF routes to a fast human quote, since carbon fiber parts get a quick look first. Upload your STL at the quote page. Our team replies within four business hours with a flat per-part price, held for 30 days. Parts ship in 2 to 5 days, made in the USA.

The Strongest 3D Printing Material, Ranked

By the 3D Printer on Demand team · Updated July 2026

The strongest FDM material we print is PA-CF, which is nylon with carbon fiber in it. It pulls to about 80 MPa and holds shape to about 140 C. PETG and ABS come next, both tough enough for daily working parts. PLA ranks last for real use, because it cracks on impact and softens at 57 C. One warning before the ranking. Strong means four different things. Pick the wrong one and you can end up with a broken part made from the best plastic on the list.

Strong means four different things

This is the part most rankings skip, and it is the reason people spec the wrong plastic. A single strength number cannot describe a part.

Ask which kind of strong your part needs before you look at any list.

The four kinds of strength, what each one means, and which material wins it.
Kind of strong	What it means	Winner of the five
Tensile strength	How hard you can pull before it breaks	PA-CF at 80 MPa
Stiffness	How little it bends under load	PA-CF, by a wide margin
Toughness	How well it survives a knock or a drop	PETG and TPU
Heat under load	How warm it can get before it goes soft	PA-CF at 140 C

A bracket that must not sag wants stiffness and heat, so it wants PA-CF.
A housing that gets dropped wants toughness, and PETG beats PLA badly there.
Only one case lets the tensile number tell the whole story: a part pulled in a straight line.
PLA and PETG share a tensile number and act nothing alike in real use.

The honest ranking

Here are all five materials we print, with the numbers side by side. Strength is tensile strength. Heat is the point where the part starts losing shape under load.

All five FDM materials ranked by strength, with heat limit and best use.
Rank	Material	Strength	Holds shape to	Best for
1	PA-CF	80 MPa	140 C	Structural parts that must not flex
2	PETG	50 MPa	73 C	The default for working parts
3	PLA	50 MPa	57 C	Visual parts, indoor, no load
4	ABS	40 MPa	98 C	Heat, impact, painted parts
5	TPU	35 MPa	80 C	Flex, grip, and sealing

1. PA-CF, the strongest we print

PA-CF pulls to about 80 MPa and holds shape to about 140 C. Nothing else on our list is close on either number.

The carbon fibers are short and mixed through the nylon, not woven like a carbon panel. They act like rebar in concrete. The part gets much stiffer, so it holds its shape under a load that would bend PETG.

Pick it for load-bearing brackets, machine mounts, robot tooling, and jigs that run every shift. It costs more than PETG, so pick it because the part needs it, not by habit.

One practical note. Nylon soaks up water from the air, so the filament gets dried before printing. That is our job, not yours. It is also why PA-CF routes to a human quote instead of an instant price.

2. PETG, the tough default

PETG pulls to about 50 MPa and holds shape to about 73 C. On paper it ties PLA on strength. In a real part it is not a fair fight.

The difference is toughness. PETG gives a little before it breaks. A drop or a knock bends it instead of cracking a layer seam. It also resists water and many chemicals, and it holds up outdoors.

That mix is why PETG is our default for working parts. Most parts that come through here never need anything else.

3. PLA, strong on paper only

PLA pulls to about 50 MPa, the same as PETG, and that number fools people constantly.

It is brittle. It cracks on impact instead of bending. It softens at 57 C, which a sunny window or a warm plant can reach. And it creeps worse than anything else here. That means it slowly sags under a load that never lets up.

So PLA is a fine pick for a visual model, a demo unit, or a packaging insert. It is a poor choice for anything that holds weight, gets handled, or lives outside.

4. ABS, the heat pick

ABS pulls to about 40 MPa, the lowest of the rigid four. It still beats the others in one important place.

Heat. ABS holds shape to about 98 C, well past PETG. That makes it the pick for parts near a motor, in an engine bay, or anywhere the air runs warm. It also takes paint and solvent glue better than the rest.

The trade is movement. ABS shrinks the most as it cools, so a flat face past roughly 150 mm can lift at the corners. Ribs and a split part both help.

5. TPU, strong in a way the list does not measure

TPU pulls to about 35 MPa, which puts it last on the chart and completely misses the point of it.

TPU is rubbery. It bends, stretches, and springs back. In the one job that matters for a gasket, a pad, or a grip, nothing else here comes close. A rigid part in that spot fails immediately.

So do not read the bottom of the ranking as weak. Read it as a different kind of strong.

Design beats material, almost every time

Here is the honest thing a material ranking will not tell you. A well designed PETG part beats a badly designed PA-CF part, and it is not close.

The reason is that an FDM part is weakest between its layers. Print a bracket the wrong way around and you have built a seam exactly where it bends. No plastic on this list saves you from that.

Three moves matter more than moving up the ranking. Aim the layers across the load. Put a gusset at the corner that has to hold. Keep the walls at 2.4 mm or more anywhere the part takes force. Our design for 3D printing guide covers all three, and our brackets guide walks through a worked example.

So before you pay more for PA-CF, check whether the part is drawn right. It often costs nothing to fix and does more than the upgrade would.

When you need more than PA-CF

PA-CF is our ceiling, and it is a real ceiling. Say your part sees more than about 140 C, or needs metal strength. FDM plastic is the wrong answer, and we will tell you.

At that point you are looking at machining, casting, or metal printing. We do not run any of those, and we do not hold process certifications. Being clear about where our limits sit is more useful to you than a claim we cannot back.

How to get a price

PLA and PETG price instantly on our instant quote page. ABS, PA-CF, and TPU route to a fast human quote, and our team replies within four business hours.

Every price is flat and per part, held for 30 days. The per-part price steps down at 10, 50, 250, and 1,000 units, and the tiers are on our pricing page.

Parts ship in 2 to 5 days, made in the USA. If you are torn between two materials, our materials comparison puts all five side by side.

Quick takeaways

PA-CF is the strongest we print, at about 80 MPa and 140 C.
Strong means four things: tensile strength, stiffness, toughness, and heat under load. Pick the one your part needs.
PLA and PETG have almost the same tensile number and behave nothing alike. PETG bends, PLA cracks.
ABS is lowest in tension at 40 MPa and still the pick for heat, at about 98 C.
TPU ranks last on the chart and is the only right answer for a gasket or a grip.
A well designed PETG part beats a badly designed PA-CF part. Fix the design first.
PA-CF at 140 C is our ceiling. Past that, FDM plastic is the wrong process.

Have a part to print? Get an instant price.

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Common questions

What is the strongest 3D printing material?: For our FDM service it is PA-CF, which is nylon with short carbon fibers mixed in. It pulls to about 80 MPa and holds shape to about 140 C, well past anything else we print. The fibers make it stiff, so parts stay rigid under a load that would bend PETG.
Is PLA or PETG stronger?: Their tensile numbers are nearly identical, near 50 MPa each, so the chart says it is a tie. In a real part PETG wins clearly. It gives a little before it breaks, so a knock bends it instead of cracking a layer seam. It also holds shape to 73 C against PLA's 57 C, and it sags far less under steady load.
Is PA-CF stronger than ABS?: Yes, by a wide margin on both counts that matter. PA-CF pulls to about 80 MPa against ABS at about 40 MPa. It also holds shape to about 140 C against 98 C. ABS still has two advantages: it takes paint and solvent glue better, and it costs less.
Why is PLA ranked last for real use?: Three reasons, and none of them show up in the tensile number. It is brittle, so it cracks on impact instead of bending. It softens at 57 C, which a sunny window can reach. And it creeps worst of the group, meaning it slowly sags under a load that never lets up. It is still a great pick for visual parts.
Does a stronger material always make a stronger part?: No, and this trips up more buyers than any other point here. An FDM part is weakest between its layers. Print it the wrong way around and you get a seam right where it bends. A well designed PETG part will beat a badly designed PA-CF part. Fix the print angle, the gussets, and the wall thickness first.
Which material should I pick for an outdoor load-bearing part?: PETG for most of them, PA-CF when it must not flex. Both handle sun and rain far better than PLA, which softens at 57 C and gets brittle in sunlight. PA-CF adds stiffness and a 140 C heat limit. That matters if the part sits in direct sun.
How do I get a price for the strongest option?: PA-CF routes to a fast human quote, since carbon fiber parts get a quick look first. Upload your STL at the quote page. Our team replies within four business hours with a flat per-part price, held for 30 days. Parts ship in 2 to 5 days, made in the USA.