OCP3D OLD CAR PROBLEMS START AN
ENQUIRY

MATERIALS & DURABILITY / THE PLAIN-ENGLISH GUIDE

Not all plastic is the same.

Printing is how a part is made, not what it’s made of. A desk toy and a car part need very different plastics.

THE SHORT ANSWER

Can a printed part
last in a car?

Yes, if the material, design and testing suit the job. Cars already use plastic clips, knobs and trim. A printed part still has to earn its own evidence; it doesn’t inherit the original’s.

FOUR MATERIAL FAMILIES / DIFFERENT JOBS

Start with the conditions.
Then consider the plastic.

General properties, not a recommendation for your car. Grades vary.

FAMILY / 01SOURCE ↗

PLA

The proof model

WHY CONSIDER IT
Quick and cheap for checking a shape.
WHAT TO WATCH
Softens in heat. A good bench print says nothing about a parked car.
THE USEFUL QUESTION

Was the final design checked in its real material?

FAMILY / 02SOURCE ↗

PETG

Tough, with limits

WHY CONSIDER IT
Tough and practical for working prototypes and cooler jobs.
WHAT TO WATCH
Shaded interiors still get hot, and a steady load can slowly bend it.
THE USEFUL QUESTION

How hot does this spot get, and what load does it carry?

FAMILY / 03SOURCE ↗

ASA

Sun & heat resistance

WHY CONSIDER IT
Handles sun and heat much better than PLA.
WHAT TO WATCH
The name isn’t an approval. Grade, print quality and load still need checking.
THE USEFUL QUESTION

Has the finished part been tested under heat and load?

FAMILY / 04SOURCE ↗

Nylon / PA

Wear & repeated use

WHY CONSIDER IT
Tough and wear-resistant for hard-working parts.
WHAT TO WATCH
Absorbs moisture, which changes its size and strength. Grades aren’t interchangeable.
THE USEFUL QUESTION

Is this exact grade right for the moisture and load?

CAPABILITY IS NOT QUALIFICATION

Three things have to agree.

What to look for. Not a list of tests OCP3D has done.

THE MATERIAL

A useful starting point.

A datasheet describes one grade and one test piece. It helps pick a candidate, nothing more.

THE FINISHED PART

Designed for its job.

Wall thickness, layer direction and the mounting all change how a part behaves.

THE EVIDENCE

Checked in context.

Fit, heat, wear and sun get checked on that version, in that material.

See the actual status of OCP3D’s parts →

BEFORE YOU TRUST A PART

Good questions
to ask.

Don’t car parts need to be metal?

Some do. But cars are full of plastic clips, trim and knobs, and the job decides the material. OCP3D only makes non-safety-critical parts: never brakes, steering, restraints or structure.

Won’t it soften in a hot car?

The wrong plastic can. Ordinary PLA softens in a hot car; ASA holds up much better. The exact grade, heat, time and load still matter, so each part gets checked.

Material reference ↗
What about the layers splitting?

It’s a real issue. Printed parts are weaker across their layers, so print direction and wall design have to suit the load. A good-looking print doesn’t prove strength.

How do I know how long a part will last?

Only from evidence on that version, in that material, in those conditions. OCP3D’s records are early; none yet proves long-term durability, so there’s no lifespan claim.

READ THE REFERENCES

Sources, not slogans.

Manufacturer guidance behind the general descriptions above; not a test result for an OCP3D part. Reviewed 8 September 2026.

  1. Prusa ResearchPLA: properties and limitations
  2. Prusa ResearchPETG: toughness and practical uses
  3. Prusa ResearchASA: UV and temperature resistance
  4. Prusa ResearchPolyamide / nylon: wear and moisture
  5. Porsche Newsroom · 2018Porsche Classic supplies classic parts from a 3D printer

    Porsche’s parts are powder-printed (SLS); OCP3D prints with filament. An example, not an endorsement.