Material Guide: ABS & ASA

ABS is what LEGO bricks are made of. It is durable, impact-resistant, and heat-resistant. So why doesn’t everyone use it?

The Printing Nightmare

ABS shrinks when it cools.

• Warping: The corners of your print will lift off the bed.
• Splitting: Layers will crack apart.
• Fumes: It releases styrene gas (bad for you).

You NEED an enclosed printer to print ABS.

ASA: The Modern Alternative

ASA is basically “ABS 2.0”.

• UV Resistant (great for outdoor use, less relevant for FTC).
• Less warping.
• Same strength.

When to use it

• Motor Mounts: It won’t melt.
• Structural Parts: It has a tiny bit of flex before breaking, making it tough.

Verdict

If you have an enclosed printer (Bambu X1C, Voron), use ASA. If not, avoid it.