PLA, PETG, ABS, ASA and TPU: how to choose

Choose material from the part's environment and loads. Ease of printing, stiffness, toughness, heat, UV and flexibility are trade-offs; no filament is best for everything.

PLA: simple and rigid

PLA is easy to print, provides good detail and tends to warp little during printing. It suits display models, concept prototypes and lightly loaded objects.

It is relatively rigid but can be brittle; heat and UV limit many outdoor or warm-environment uses. Always check the specific formulation.

PETG: tough and versatile

PETG combines good layer adhesion, toughness and limited warping. It is a common choice for brackets, supports and functional parts that stay within the temperature limits declared by the maker.

It can string, bridge less cleanly and adhere too strongly to some surfaces. Use the bed and any separation layer specified by the manufacturer.

ABS and ASA: heat, enclosure and ventilation

ABS and ASA offer useful properties for technical parts; ASA is generally favoured outdoors for better UV resistance. Both need closer temperature control and can warp during printing.

An enclosure is normally useful or necessary for larger parts. Provide suitable ventilation and follow the material and printer manufacturers' instructions.

TPU and flexible filaments

Flexible filaments are tough, wear-resistant and suitable for seals, protection and deformable parts. The softer the material, the more critical the filament path and settings become.

They often need lower speeds, absorb moisture and can increase stringing and difficulty with bridges and supports.

Composites and engineering materials

Nylon, polycarbonate and filled composites may need high temperatures, drying, a controlled chamber and abrasion-resistant nozzles. Fibre content does not automatically make a part stronger in every direction.

Before buying, verify the whole filament path, maximum temperatures, recommended nozzle diameter and official profiles.

Three rules that prevent mistakes

  • Use the profile for the actual brand and formulation loaded.
  • Store filament sealed with desiccant and dry only as instructed.
  • Do not claim food, medical or safety suitability without the conformity required for that use.

Choose essential properties first, then remove materials the printer or workspace cannot handle correctly.

Official sources