PLA or PETG: Which Material Suits a 3D Printed Lamp

With a 3D printed lamp, the material decides two things at once: how the lamp looks and how long it lasts under light. You'll most often come across two plastics, PLA and PETG. Both can be printed at home or professionally, but they behave differently.

How they differ

PLA is rigid, holds its shape well, and has a nice matte surface that softly diffuses light. Its weak point is heat. It starts to soften at around 55 to 60 °C, so it doesn't like direct sun on a windowsill or a hot light source sitting right next to the lampshade's wall.

PETG handles more heat, roughly up to 80 °C, and is tougher. It resists drops and bending better. It's a bit trickier to print and tends to be slightly more translucent, which changes the character of the light through a lampshade: more light shows through and less gets softened.

Why it's not just about temperature

With modern LED bulbs in an E27 socket up to about 9 W, the practical difference is smaller than it seems. LEDs shine cool and don't heat up like an old incandescent bulb. A PLA lampshade won't reach its softening point with a bulb like that, because the source simply doesn't put out enough heat.

The problem shows up elsewhere. If you put a powerful halogen or an old tungsten bulb into the lamp, the heat can already be too much for PLA. That's why a 3D printed lamp should only ever have an LED inside, not anything that shines and heats at the same time.

What this means for how the light looks

PLA gives that typical soft, even glow that people want from a designer lamp. The light spreads evenly across the whole lampshade. PETG looks sharper, and sometimes you can see exactly where the bulb sits. For mood lighting in a living room or bedroom, PLA is usually the more pleasant choice.

When to reach for PETG

PETG makes sense wherever the lamp will face rougher handling or heat. A kid's room, where the lamp occasionally gets knocked over. A spot near a window with direct summer sun. A workshop or a kitchen countertop. If durability matters more to you than soft light, PETG is a sensible compromise.

For most indoor lamps, though, a simple rule applies. PLA for looks and soft light, an LED bulb inside, and keep the lamp out of direct sunlight. That covers the vast majority of situations.

How we handle this at Printhia

We print our designer lamps like KUMO and Lumira so the material, the lampshade's shape, and the recommended bulb all work together. That means you don't have to think about temperature charts: the right LED comes with the package, and the lamp is designed to look good and last.

TLDR

• PLA is rigid and gives a soft, even light, but softens at around 55 to 60 °C.
• PETG handles more heat (up to about 80 °C) and is more durable, with sharper light showing through it.
• With an E27 LED bulb up to 9 W, PLA is plenty, since an LED barely heats up.
• Consider PETG for a kid's room, a window with direct sun, or anywhere the lamp might get dropped.
• A 3D printed lamp belongs out of direct sunlight and always with an LED, never a hot bulb.