It seems like a lot of commenters don’t fully understand why you would want a high chamber temperature. For materials like PLA and PETG, an enclosed printer can be helpful mainly to block cold drafts that might cause parts to lift or warp off the bed, but those materials generally prefer a low ambient air temperature and strong part cooling. This is why many enclosed printers recommend leaving doors open or actively venting when printing PLA, and why some machines include automatic exhaust systems to prevent the chamber from heating up too much.
Materials like ABS, ASA, Nylon, and Polycarbonate behave very differently. These materials generally benefit from, and in some cases require, a much warmer ambient air temperature to reduce thermal gradients within the part (carbon/glass filled materials dramatically help too). Keeping the entire print warm improves layer bonding, reduces internal stress, and dramatically lowers the chance of warping or cracking. A basic enclosure helps by trapping heat generated by the heated bed, but relying on the bed alone places a hard limit on how warm the chamber can get. Insulating the enclosure improves heat retention, but the most effective solution is adding an auxiliary heat source, commonly referred to as a chamber heater.
A chamber heater allows you to actively set and maintain a target chamber temperature, often controlled through the printer or slicer, such as 60-70C for materials like ABS or ASA. The heater cycles on and off to hold that temperature consistently and also shortens warm-up time before a print starts, which is especially important for large or long-running jobs.
Chamber heaters must be integrated safely. This typically means using a properly rated solid state relay to control heater power, redundant thermal safety cutoffs, correct grounding and electrical isolation, and firmware or controller integration so the heater shuts off automatically when a print finishes or if a fault occurs.
If you don’t have a chamber heater but still want stronger and more reliable prints, a common approach is to heat soak the enclosure using the heated bed. By bringing the bed up to the final print temperature and holding it there for 10 to 20 minutes (depending on enclosure size and bed power), the chamber air, frame, and motion components can reach a more stable temperature. Many setups also use a bed fan mod to circulate warm air from the bed throughout the chamber, helping reduce temperature stratification and improving print consistency.
In short, chamber heaters aren’t about making every printer hotter all the time. They exist to give you control over the thermal environment when the material demands it. Once you move beyond PLA and PETG, controlling chamber temperature becomes an important factor in print reliability, part strength, and dimensional accuracy, not a luxury feature or a gimmick.
Do not use a space heater to uncontrollably preheat your chamber in any circumstance😅
Taken from Facebook