Polycarbonate is usually the material people reach for after PETG and ABS have already let them down on heat or impact resistance. It is stronger and more heat resistant than either, but it is also a lot less forgiving to print: it wants nozzle temperatures other filaments never see, a bed hot enough to warp a cheap build surface, and in most cases a sealed, heated enclosure just to hold its shape while it cools. This guide covers the temperature and enclosure requirements behind that, why drying matters here more than almost anywhere else, and how the PC blends sold to hobbyists differ from the pure material. For a broader comparison of PC against other materials, see the 3D printer filament types guide or the engineering filaments overview. For a head-to-head against ABS specifically, see the PC vs ABS comparison.
What polycarbonate is and why it runs hotter than almost everything else
Polycarbonate is a thermoplastic with a glass transition temperature, the point where it starts to soften, of around 147°C. That is well above PLA’s roughly 55-60°C, PETG’s roughly 75-85°C, and ABS’s roughly 100-105°C. That gap is the entire reason PC exists as a hobbyist filament: it keeps its shape and its strength at temperatures that would leave a PETG or ABS part soft and useless. It also carries genuinely high impact resistance in its industrial form, the kind of toughness that shows up in safety glasses and machine guards, and some of that carries over to printed parts, which is why a well-printed PC part can survive a drop that would crack an ABS part outright. The tradeoff is a material that is considerably harder to get through a desktop printer without warping, delaminating, or clogging along the way.
Nozzle temperature: 260-310°C, and why you need an all-metal hotend
Pure, unblended PC generally needs a nozzle temperature somewhere in the 280-310°C range, and some manufacturers’ high-temperature grades run higher still. PC blends built for desktop printers, PC-ABS and similar, usually print cooler, more like 250-280°C, which is one reason blends have become the common recommendation for hobbyists rather than pure PC. Polymaker’s technical data sheet for its PolyMax PC lists a starting point around 265°C, while sources covering unblended PC point toward 280-320°C. Check the temperature printed on your specific spool rather than assuming all “PC” filament behaves the same, and expect to be working near the top of your hotend’s rated range rather than comfortably inside it.
At those temperatures, a standard hotend is not optional equipment, it is a requirement. PTFE-lined heat breaks and Bowden tubes used in many stock hotends are not built to survive sustained exposure much above roughly 250-260°C, and will off-gas or degrade if you push PC temperatures through them. You need an all-metal hotend rated for the temperature your filament calls for, generally 300°C or higher for some margin, the same requirement covered at a lower bracket on this site’s ABS print settings guide, except here there is essentially no wiggle room to skip it.
Bed temperature and getting PC to stick
PC needs a hot bed, typically in the 90-120°C range depending on the blend, with PC-ABS type blends often sitting toward the lower end around 90-110°C. That is hot enough to warp or delaminate generic glass or low-cost build surfaces, so a PEI sheet or a surface specifically rated for high-temperature printing is close to mandatory. Even with the right surface and the right bed temperature, PC still shrinks as it cools, which is where the enclosure stops being optional.
Why a sealed heated enclosure is close to mandatory
PC is one of the least forgiving materials on this site when it comes to ambient temperature around the print. A stray draft across an open printer is enough to cool one side of a tall PC part faster than the other, and the resulting difference in shrinkage is what causes the corner lifting and mid-print delamination PC is known for. Forum reports and community testing, including threads on the Prusa forum, consistently point to the same fix: an enclosed, heated chamber, with a chamber temperature around 60°C or higher recommended specifically for PC. Some hobbyists get away with printing small, low, simple PC parts on an open frame printer by controlling cooling and geometry carefully, but for anything tall or complex, a sealed enclosure stops being a nice-to-have. The best enclosed 3D printer guide and the 3D printer enclosure guide cover what a chamber needs to actually hold heat rather than just keep dust out, and the best professional 3D printer guide covers machines built with PC in mind from the start.
Drying PC before you print it
Polycarbonate is highly hygroscopic, absorbing moisture fast enough that even a spool fresh out of vacuum packaging can print worse than you would expect. Wet PC shows up as surface bubbling, a hazy or cloudy finish instead of the material’s normal clarity or gloss, popping and hissing at the nozzle, and a real drop in layer strength you will not necessarily be able to see just by looking at the part. Recommended drying temperatures vary by source, generally somewhere between 70°C and 90°C for 6 to 12 hours depending on how wet the spool is and whose guidance you follow, so treat that as a starting range rather than a fixed number. Given how much a PC print already costs you in time, filament, and hotend wear, drying is not a step worth skipping. See the how to dry 3D printer filament guide for the process, and the wet filament symptoms guide if you want to confirm moisture is actually your problem before troubleshooting something else.
Pure PC vs PC-ABS vs “easier” PC blends
Very little of what gets sold to hobbyists as “PC filament” is pure, unblended polycarbonate. PC-ABS blends combine PC’s heat and impact resistance with ABS’s more workable melt behavior, printing in the 250-280°C range instead of pushing past 300°C, at the cost of somewhat lower heat resistance than pure PC. Several brands also sell PC blends marketed as tougher or easier to print than straight PC, generally by mixing in a co-polymer or additive package meant to improve layer adhesion and reduce warping. Treat those marketing claims as a starting point for your own testing rather than a guarantee, since formulations vary by brand. What stays consistent across brands is the general pattern: blends print more like a hot ABS, while pure PC demands the full setup described above.
When PC is actually worth it
PC makes sense for parts that need real heat resistance and real impact resistance at the same time: jigs and fixtures used near heat sources, brackets and mounts that need to hold their dimensions under load and temperature, and enclosures for electronics that run warm. If a part only needs one of those two properties, there is usually an easier material for the job; ASA or ABS covers moderate heat, and nylon or carbon-fiber-reinforced nylon covers toughness without PC’s temperature demands. PC is worth reaching for specifically when PETG or ABS have already been tried and have already failed on heat or impact grounds, not as a default upgrade. It is a harder material to print well, and treating it as a drop-in replacement for ABS is the fastest way to end up with a pile of warped, delaminated parts.
Polycarbonate printing checklist
- Check your specific spool’s rated nozzle temperature, generally 260-310°C, and confirm your hotend can hold it
- Use an all-metal hotend rated for 300°C or higher, not a standard PTFE-lined one
- Set the bed to 90-120°C with a PEI or high-temperature build surface
- Print inside a sealed, heated enclosure, especially for tall or complex parts
- Dry the filament before printing, even from a freshly opened spool
- Match the PC type, pure, PC-ABS, or a tougher blend, to what the part actually needs