Choosing a filament: PLA, PETG, ABS/ASA or TPU

PLA: the default

Easy to print, stiff, sharp details, many colors. Use it for most indoor parts: boxes, labels, keychains, organizers, Gridfinity, desk items.

Weak point: it softens around 55–60 °C. Don't use it in a hot car, in direct summer sun, near a heater or in the dishwasher.

PETG: tougher and more heat resistant

Slightly flexible, so it bends before it breaks. Handles more heat (around 75 °C) and moisture. A good choice for clips, hooks, brackets, outdoor parts in the shade and anything that snaps.

It strings a bit more than PLA and sticks very well to smooth PEI beds; use glue or a textured plate as a release layer.

ASA and ABS: for sun and heat

ASA holds up in UV light and heat (around 95 °C), so it suits parts that live outside or in a car. ABS is similar but yellows in the sun. Both need an enclosed printer and good ventilation.

TPU: flexible

Rubber-like. Use it for bumpers, feet, grips and gaskets. Print slowly. A few generators mention in their printing tips when TPU is the better choice.

Food and drink

A printed part is not food safe just because the filament is. Layer lines trap bacteria and are hard to clean. Use printed parts for dry food (cookie cutters, clips, holders) and short contact, and don't put them in the dishwasher unless the material is made for it.