3D Printing Materials: Pick the Plastic Your Part Needs

Pick PETG for most working parts. It is tough, it shrugs off water and many chemicals, and it holds up outdoors, so that a part you ship keeps working in the field. PETG is our default for production. If the part is only for show or lives indoors, PLA costs less and prints crisp detail. If the part sees real heat, pick ABS. If it has to carry load or take stress, pick PA-CF. If it has to bend or seal, pick TPU. If it lives outside in the sun, pick OPM, an outdoor-grade plastic made for sun and weather.

The right pick comes down to four questions. How hot does the part get? How hard does it get hit or loaded? Does it live outside? Does it need to flex? Answer those four and the material almost picks itself. Still not sure? Upload your part and we will suggest a fit. Use the instant quote to start.

In real parts, the big three trade heat, toughness, and finish. PETG bends before it breaks and works outside. PLA is stiff and prints the cleanest detail, but it cracks under a sharp hit and softens in a hot car. ABS takes the most heat and paints well, but big flat ABS parts can warp as they print, so we watch flatness on those.

Here is how they compare on heat. Heat is how well a material keeps its shape as things warm up. This is a ranking across the materials we sell, not a published specification: filament brands differ widely on the same nominal material, so a single number here would describe no real spool. Published strength figures do not rank cleanly across these materials at all, since manufacturers measure different things and products sold under one polymer name disagree. See the published figures for the actual numbers. If a design temperature or a load matters, ask for a review and we will work to the number that matters to you.

• PETG

  Holds shape to

  Lower

  Outdoor use

  Yes

  Flex

  Rigid

  Best for

  Outdoor parts, enclosures, jigs

• PETG-CF

  Holds shape to

  Lower

  Outdoor use

  Yes

  Flex

  Stiff

  Best for

  Jigs, fixtures, parts that must hold their shape

• OPM

  Holds shape to

  Not published

  Outdoor use

  Built for it

  Flex

  Rigid

  Best for

  Outdoor mounts and covers that sit in the sun

• PLA

  Holds shape to

  Lowest

  Outdoor use

  No

  Flex

  Rigid

  Best for

  Visual prototypes, indoor fixtures

• ABS

  Holds shape to

  High

  Outdoor use

  Some

  Flex

  Rigid

  Best for

  Heat exposure, painted parts

• PA-CF

  Holds shape to

  Highest

  Outdoor use

  Yes

  Flex

  Stiff

  Best for

  Load-bearing brackets, tooling

• TPU

  Holds shape to

  Varies by product

  Outdoor use

  Yes

  Flex

  Flexible

  Best for

  Gaskets, grips, seals, feet

A strength number would only be part of the story anyway. PLA and PETG often test close on paper, but PLA snaps under a sharp hit while PETG bends first. For any part that gets handled, dropped, or loaded, that toughness gap matters more than any single figure. This is why we steer most working parts to PETG even where PLA looks similar on a spec sheet.

Want the design rules that keep any of these printing clean? See the 7 design checks before you upload.

You need PA-CF when the part carries load, holds tight tolerance, or sits near heat that would soften PETG. PA-CF is carbon fiber nylon, our usual pick for load bearing parts, and it holds its shape at the highest heat of our five core materials. Pick it for structural brackets, end-of-arm tooling, and jigs that take stress, so that the part keeps its shape under real working load.

You need TPU when the part has to bend and spring back. TPU makes gaskets, gripper pads, bumpers, and seals. A rigid material would crack where TPU just flexes and returns to shape.

Both PA-CF and TPU get a fast human quote, not an instant online price. A person checks the file. A person reviews your request and follows up by email.See the PA-CF page and the TPU page for full specs and design tips.

Material is only one part of the price, but it does move the number. PLA and PETG cost the least per part. ABS sits in the middle. TPU costs more because it prints slowly. PA-CF costs the most, because the filament is pricey and the printer runs slower to lay it down clean.

PLA and PETG get an instant price the second you upload. ABS, PA-CF, and TPU route to a fast human quote. Either way, the price per part drops as your order grows, and every part ships in 3 to 5 business days. Upload your STL to see real numbers for your part, or check FDM printing for how we run the job.