A heated chamber 3D printer has a dedicated heater that warms the air inside its enclosure to a set temperature, separately from the bed. Twelve shipping printers in the database have one, rated 60 or 65 °C. A passive enclosure has no heater, yet makers quote a chamber temperature for both kinds, so the same number can mean different things.
What is a heated chamber 3D printer?
A heated chamber 3D printer is an enclosed printer with its own chamber heater, which warms the air around the part to a set temperature independently of the bed. Twelve shipping printers in the database have one, and their makers rate the chamber at 60 or 65 °C. They come from Anycubic, Bambu Lab, Creality, Flashforge and QIDI.
The chamber temperature list shows all 12 beside the passive enclosures, sorted by chamber rating. Three makers describe the heater in their own words:
- QIDI lists “Up to 65° C Independent Chamber Heating” from a positive temperature coefficient (PTC) heater on the QIDI Q2.
- Bambu Lab lists “65°C active chamber heating” on the Bambu Lab H2D.
- Creality lists an “Active Chamber Heater” and a chamber temperature of “≤ 60 ℃” on the Creality K2 Plus.
The heat is for engineering filaments. Bambu Lab’s filament guide says ABS, ASA, polycarbonate (PC), nylon (PA) and their fiber-filled grades “require higher heatbed and chamber temperatures to suppress warping and layer separation.” Its Bambu Studio slicer heats the chamber to 60 °C by default on the Bambu Lab X1E for PC, PA and fiber-filled PA. For ABS and ASA the default is off, with 60 °C suggested for large or warp-prone parts.
For printers that match those materials, 3D printers for polycarbonate lists the enclosed models that reach the hotend and bed temperatures PC needs. 3D printers for nylon lists those that pair an enclosure with a hardened nozzle.
What is the difference between a passive and an actively heated chamber?
A passive enclosure only traps heat from the bed and hotend, so its temperature depends on the bed setting, the room and how long the printer has run. An actively heated chamber adds a heater, so it can reach and hold a set temperature even with a cool bed or a cold room.
Makers’ labels blur the line. Prusa’s page for the Prusa CORE One+ (Gen 2) lists its “Active chamber heating” as “Yes (up to 55 °C)”. The comparison table on Prusa’s CORE One L+ page calls the same printer’s chamber “Passive (up to 55°C)”.
Tom’s Hardware’s review of the original Prusa CORE One, also rated 55 °C, found no separate chamber heater. The printer warms its chamber by running the bed at 115 °C. In the reviewer’s chilly basement, it reached 47 °C on preheat and 55 °C within the first 30 minutes of printing.
The larger Prusa CORE One L+ reaches 60 °C the same way: two fans under its heatbed blow air across the hot surface, which Prusa calls “Active Convection.” None of these Prusa printers has a heater of its own, so the database lists them as passive enclosures.
Bambu Lab is plainer about the Bambu Lab P2S. Its page advertises a “50°C Chamber,” and its FAQ says the P2S “does not have an active chamber heating function.” Instead, a flap switches between internal and external air circulation.
A chamber can also run too warm. Bambu Lab’s filament guide says to open the front door or remove the top glass of its enclosed printers when PLA, PVA or TPU prints on a bed above 45 °C. Otherwise chamber heat can soften the filament before it reaches the nozzle. QIDI’s Plus5 page advises keeping the chamber at 45 °C or less for PLA, and about 10 °C below any filament’s softening temperature.
How do you compare chamber temperature ratings between brands?
Check three things before comparing ratings: whether the printer has a chamber heater, what the maker’s number describes, and whether a figure exists at all. An active rating is the most the heater will hold; a passive rating is what the enclosure reaches from bed heat. Heated and passive 60 °C ratings are not equivalent.
- Heater or not. The database marks each enclosed printer “Actively heated chamber” or “Enclosed (passive)”. Check that column before the number. A maker’s own label may not settle it: Prusa uses both words for one printer.
- What the number means. Bambu Lab lists the H2D under “Active Chamber Heating” with a “Max Temperature” of 65 °C, the heater’s highest setting. Creality ties the K2 Plus figure to materials in a footnote: “60℃ chamber temperature for ABS, ASA and PPS.” Passive figures, such as 50 °C for the P2S and 55 °C for the CORE One+ (Gen 2), are what the enclosure reaches with a hot bed. None of these maker pages states the room temperature or warm-up time behind its figure.
- Whether a figure exists. The Bambu Lab P1S, Creality K1 Max and Elegoo Centauri Carbon are enclosed but have no published chamber figure. A dash in the database means no published number, not a low one.
Heater power is a separate figure from the rating. QIDI rates both the QIDI Q2 and the QIDI Plus5 at 65 °C, but gives the Q2 280 W of chamber heating and the Plus5 550 W.
When did the heated chamber patent expire?
Stratasys’ heated build chamber patent, US 6,722,872 B1, expired on February 27, 2021. Titled “High temperature modeling apparatus,” it was filed as an international application on June 23, 2000 and granted on April 20, 2004. A patent term adjustment ran it 249 days past the usual 20 years from filing. Stratasys confirmed the expiry to 3D Printing Industry.
The patent covered one layout, not every heated enclosure. Its first claim is a machine with “a heated build chamber” whose x-y-z gantry, the mechanism that moves the head and base, “is located external to the build chamber and is separated from the chamber by a deformable thermal insulator.” 3D Printing Industry summed it up as “a heated build chamber isolated from the printer’s motors and electronic components.” A later claim names a chamber heated above 150 °C.
The record also shows a US provisional application filed on June 23, 1999, which sets the priority date. Stratasys paid the maintenance fees in 2007, 2011 and 2015, so the patent ran its full adjusted term.
Every printer with an actively heated chamber in the database was announced or released after that date. The earliest is the QIDI X-Max 3, on sale in March 2023 and now discontinued. QIDI’s page lists it with “65°C Independent Chamber Heating.”
