QIDI spent years as the brand serious makers namechecked but rarely bought, then shipped a CoreXY printer with an actively heated chamber and a 370°C nozzle at a price that undercuts Bambu’s equivalent machine. This site has referenced the Plus4 as a supporting pick in its carbon-fiber and enclosed-printer guides for months — here’s the dedicated look at what that heated chamber actually buys you.
QIDI Plus4 by the numbers
- 65°C active chamber, ~8 minutes to heat — the Plus4’s dedicated 400-watt chamber heater, per QIDI’s own spec sheet, versus a passive enclosure that only traps ambient heat from the bed and hot end.
- 370°C max nozzle temperature — hot enough for PPS-CF, one of the highest-temperature composites sold to hobbyists, and well above the roughly 300°C ceiling on most passively enclosed printers.
- 305×305×280 mm build volume — about 40% more usable bed area than the Bambu Lab P1S’s 256×256×256 mm, in a similarly footprint-sized enclosed machine.
- $799 MSRP, $699 sale — QIDI’s own store price as of this review, undercutting the comparable Bambu Lab X2D’s $649-$999 range for a machine with the same active-chamber capability.
- 10 mm dual linear shafts and lead screws — a mechanical upgrade over the thinner rods common on budget CoreXY machines, aimed at keeping the heavier, larger bed rigid at speed.
QIDI Plus4 vs the enclosed-printer field at a glance
| Printer | Build volume | Chamber | Max nozzle temp | Multi-color | Price |
|---|---|---|---|---|---|
| QIDI Plus4 | 305×305×280 mm | Active, 65°C | 370°C | Add-on (QIDI Box) | $699-799 |
| Bambu Lab X2D | 256×256×256 mm | Active, 65°C | 320°C | Built-in AMS 2 Pro | $649-999 |
| Bambu Lab P1S | 256×256×256 mm | Passive | 300°C | Optional AMS | ~$699 |
| Creality K1C | 220×220×250 mm | Passive | 300°C | No | ~$399 |
The Plus4 and X2D are the two active-chamber machines here, and they’re the only two rated for the toughest composites like PPS-CF. The P1S and K1C are passively enclosed — fine for ABS and ASA, but not built to hold the sustained heat that PA-CF and PC-CF need to print without warping.
The 30-second verdict
Buy the QIDI Plus4 if you print carbon-fiber or high-temp composites regularly. The active 65°C chamber and 370°C nozzle put it in the same capability class as the pricier Bambu X2D, and the larger 305×305×280 mm bed gives more room for large functional parts.
Buy the Bambu Lab X2D instead if ecosystem and calibration polish matter more than price. Bambu’s LiDAR-assisted first-layer calibration and built-in AMS 2 Pro multi-color support are more mature than QIDI’s still-rolling-out QIDI Box accessory.
Skip it if you only print PLA and PETG. A 65°C active chamber and 370°C nozzle solve a problem those materials don’t have — a passively enclosed printer like the Bambu Lab P1S costs about the same and is simpler to run.
QIDI Plus4
- 305×305×280 mm build volume, 65°C actively heated chamber (~8 min to temp), 370°C hardened-steel nozzle.
- Dual independent Z-motors, 10 mm linear shafts and lead screws, 1080P camera with time-lapse.
- Rated for PA-CF, PC-CF, and PPS-CF; multi-color available via the separate QIDI Box add-on.
Stocking filament and parts for a shop? A free Amazon Business account unlocks quantity discounts and tax-exempt purchasing for spools, spare nozzles, and hardened build plates.
Why the active chamber matters for carbon-fiber filament
A passive enclosure, like the one on the Bambu P1S or Creality K1C, only traps the heat that already radiates off the bed and hot end during a print — useful for keeping ABS and ASA from warping, but it can’t hold a consistent target temperature. The Plus4’s chamber has its own 400-watt heater and sensor loop, so it reaches and holds 65°C regardless of what the hot end and bed are doing. That matters most for carbon-fiber-reinforced nylon (PA-CF) and polycarbonate blends (PC-CF), which shrink unevenly as they cool and lift at the corners or delaminate between layers without sustained ambient heat. PPS-CF, one of the hottest-printing composites sold to hobbyists, needs both the 65°C chamber and the 370°C nozzle ceiling to run at all — a passively enclosed printer simply can’t get there.
QIDI Plus4 vs Bambu Lab X2D
Both are actively heated CoreXY machines built for the same buyer — someone printing carbon-fiber or high-temperature composites who has outgrown a passive enclosure. The Plus4’s 305×305×280 mm bed is roughly 40% larger by area than the X2D’s 256×256×256 mm, and at $699 on sale it can undercut the X2D’s lower configurations while matching the 65°C active chamber. The X2D counters with a higher-resolution LiDAR calibration system, Bambu’s more mature slicer software, and a built-in AMS 2 Pro for four-color printing out of the box — the Plus4’s equivalent QIDI Box multi-material system is a separate, newer accessory. Buy the Plus4 for bed size and price; buy the X2D for ecosystem maturity and built-in multi-color.
Bottom line
The QIDI Plus4 earns a real spot in the enclosed-printer conversation: a $699-799 machine with an active 65°C chamber and a 370°C nozzle that matches capability most competitors reserve for $900+ flagships. Buy it if PA-CF, PC-CF, or PPS-CF are on your print list and you want the biggest active-chamber bed at this price. Choose the Bambu Lab X2D instead if built-in multi-color and calibration polish matter more than bed size, or drop to a passively enclosed machine like the Bambu Lab P1S if you only print PLA, PETG, ABS, and ASA.
Related guides
- Best enclosed 3D printer — where the Plus4 fits against passively enclosed picks like the Bambu P1S and budget Elegoo Centauri Carbon.
- Best carbon fiber 3D printer — the Plus4’s full case as the value pick for PA-CF, PET-CF, and PC-CF work.
- Bambu Lab X2D vs P1S — how the Plus4’s closest active-chamber rival compares to Bambu’s passively enclosed workhorse.