A Practical Guide to 3D Printing With Polycarbonate

What Makes Polycarbonate Different

Polycarbonate is the same family of plastics used in bulletproof glass, safety helmet visors, and aircraft canopies. In filament form, it brings that toughness to desktop 3D printing. Printed PC parts absorb impacts that would crack ABS and shatter PLA, and they hold shape at temperatures where most common filaments sag.

The downside is that PC does not forgive lazy setup. It prints at 260-310 C, needs a heated bed north of 100 C, and warps badly unless the printer is enclosed. Wet filament will bubble, string, and delaminate. This is a material for people who want real mechanical performance and are willing to earn it.

When to Choose PC

Reach for polycarbonate when the part needs to survive drops, repeated impacts, or sustained heat above 90 C. It is also the best option among common FDM materials when you need light transmission: clear PC prints translucent enough for diffusers, light pipes, and lens housings.

Do not use PC for decorative prints, outdoor parts in direct sun, or large flat panels on open-frame printers. ASA handles UV better, PETG is easier, and PLA is far cheaper for looks.

Hardware You Actually Need

• All-metal hotend: PTFE-lined hotends degrade above 240 C. You need a hotend rated for 300 C.
• Heated bed: 110-120 C is the practical minimum. A high-temp build plate helps.
• Enclosure: A chamber holding 40-60 C cuts warping dramatically. Open-frame machines will struggle.
• Hardened or stainless nozzle: Brass works but can oxidize and leave discoloration in clear prints.

Settings That Work

Start with a 280 C nozzle, 110-120 C bed, and the part cooling fan off or below 20%. Print slowly: 30-60 mm/s for perimeters and infill. Thicker layers bond better, so 0.20-0.25 mm is a good starting point. Use a 6-8 mm brim on large flat parts.

Drying is not optional. Dry PC at 80 C for 6-12 hours before printing, and keep it in a dry box while printing. If you hear popping from the nozzle, stop and dry it again.

Bottom Line

Polycarbonate is not a beginner material, and it does not pretend to be. It asks for an enclosed printer, careful drying, and slow speeds. Give it that, and it produces some of the strongest, most heat-resistant parts you can pull off a desktop FDM machine.