An image showing the QIDI Optimize Your 3D Prints with Q1-Pro Expansion Fan, which is an additional cooling fan designed for the QIDI Q1 Pro 3D printer, featuring a black fan with wires and a connector. QIDI Q1 Pro Extruder Expansion Fan
QIDI Q1 Pro Extruder Expansion Fan

QIDI Optimize Your 3D Prints with Q1-Pro Expansion Fan | Qidi Tech Qidi 3D Printer

$40.99

QIDI Q1 Pro Extruder Expansion Fan The QIDI Q1 Pro Extruder Expansion Fan is a 40mm auxiliary cooling fan that mounts to the Q1 Pro extruder, reducing heat sink temperature by...

Qidi Tech 3D Printers Filaments Accessories

Description

QIDI Q1 Pro Extruder Expansion Fan

The QIDI Q1 Pro Extruder Expansion Fan is a 40mm auxiliary cooling fan that mounts to the Q1 Pro extruder, reducing heat sink temperature by 8-15C, eliminating heat creep and stringing with PLA/PETG, and improving overhang print quality — it costs $40.99, installs in 10 minutes with 2 screws, and is compatible only with the QIDI Q1 Pro.

The Q1 Pro Extruder Expansion Fan is a purpose-built upgrade for the QIDI Q1 Pro 3D printer. It adds a second 40mm fan to the extruder assembly, directing airflow across the heat sink and stepper motor to prevent heat creep — the condition where hot-end heat migrates upward into the cold end, causing filament to soften prematurely, jam, and string. The fan comes pre-assembled with a 3D-printed mounting bracket, a 2-pin JST connector, and a cable long enough to reach the mainboard fan header.

Product Specifications

Parameter Value
Product Name QIDI Q1 Pro Extruder Expansion Fan
Price $40.99 USD
Fan Size 40 x 40 x 10 mm
Fan Type DC brushless axial fan
Voltage 24V DC
Connector 2-pin JST-XH (red)
Cable Length ~200mm
Mounting 3D-printed PETG bracket, 2x M3 screws
Airflow ~5.5 CFM (at 24V)
Noise Level ~28 dB(A)
Speed ~8000 RPM (at 24V)
Bearing Type Sleeve bearing
Expected Fan Lifespan 30,000+ hours
Compatibility QIDI Q1 Pro only
Installation Time ~10 minutes
Tools Required Phillips #2 screwdriver
Weight ~25g
Warranty 90 days

How It Works

The Heat Creep Problem

During long prints, especially with PLA and PETG, heat from the hot end can migrate upward through the heat break into the cold end (heat sink). When the heat sink temperature rises above 45-50C, the filament begins to soften before it reaches the melt zone. This causes three problems: (1) filament jams because the softened filament swells and binds in the PTFE tube, (2) inconsistent extrusion because the filament diameter changes as it softens, and (3) stringing because the softened filament oozes more readily. The stock Q1 Pro fan provides some cooling but can be insufficient during long prints at high ambient temperatures or in enclosed chambers.

The Expansion Fan Solution

The expansion fan mounts directly to the extruder assembly, blowing air across the heat sink fins from a second angle. This supplemental airflow reduces heat sink temperature by 8-15C (measured at 50C ambient), keeping the cold end below 40C even during 8+ hour prints. The fan is wired in parallel with the stock extruder fan, so it runs whenever the stock fan runs — no firmware changes needed. The 3D-printed mounting bracket positions the fan at the optimal angle to direct airflow across the heat sink without interfering with the part cooling fan or the print area.

Temperature Reduction Data

Condition Stock Fan Only Stock + Expansion Fan Reduction
Idle (25C ambient) 32C 28C 4C
Printing PLA (25C ambient) 42C 34C 8C
Printing PETG (25C ambient) 48C 37C 11C
Printing PLA (35C ambient) 55C 42C 13C
Enclosed chamber (45C) 62C 47C 15C

Pros & Cons

Pros (Advantages)

  1. Reduces heat creep: Lowers heat sink temperature by 8-15C, preventing filament jams and inconsistent extrusion during long prints.
  2. Reduces stringing: Cooler cold end means filament stays firm until the melt zone, reducing oozing and stringing by 30-50% with PLA/PETG.
  3. Improves overhang quality: More stable extrusion temperature produces cleaner overhangs and bridges, especially with PLA.
  4. Easy installation: 10-minute install with 2 screws. No firmware changes, no wiring modifications — plug into existing fan header.
  5. Affordable: At $40.99, it is one of the cheapest performance upgrades for the Q1 Pro.
  6. Quiet operation: ~28 dB(A) noise level — barely noticeable over the stock fan and stepper motors.
  7. Pre-assembled bracket: The 3D-printed mounting bracket is pre-installed, so you do not need to print your own.
  8. Plug-and-play wiring: 2-pin JST connector plugs directly into the Q1 Pro mainboard fan header. No soldering.
  9. Long fan lifespan: 30,000+ hour sleeve bearing fan — should last 3-5 years with normal use.
  10. Lightweight: At ~25g, it adds negligible weight to the extruder, preserving print speed and acceleration.
  11. Works with all filaments: Benefits PLA and PETG most, but also helps with TPU, nylon, and any filament sensitive to heat creep.
  12. OEM quality: Designed and tested by QIDI specifically for the Q1 Pro — perfect fit, no compatibility issues.

Cons (Limitations)

  1. Q1 Pro exclusive: The mounting bracket and connector are specific to the QIDI Q1 Pro. Will not fit QIDI X-MAX 3, X-Plus 3, or any other printer.
  2. Not a part cooling fan: This fan cools the extruder/heat sink, not the printed part. It does not replace the part cooling fan for overhangs.
  3. Requires opening the electronics cover: Installation requires removing the extruder cover to access the fan header. Some users may find this intimidating.
  4. Adds a cable to the extruder: The fan cable adds one more wire to the cable chain, which can be slightly messy if not routed carefully.
  5. Sleeve bearing fan: Uses a sleeve bearing rather than a dual-ball bearing. Sleeve bearings are quieter but have shorter lifespan at high temperatures.
  6. Benefit is marginal with ABS/ASA: ABS and ASA are printed at higher temperatures where heat creep is less of an issue. The fan provides minimal benefit for these filaments.
  7. No speed control: The fan runs at full 24V speed whenever the stock fan runs. There is no PWM speed control for the expansion fan alone.
  8. Plastic bracket: The mounting bracket is 3D-printed PETG, which can deform at very high chamber temperatures (above 60C).
  9. Shipping time: Free US shipping takes 15-25 business days. Expedited options available at extra cost.
  10. No included instructions in box: Installation guide is available online but not printed in the package.
  11. Single fan only: Package contains one fan assembly. No replacement fan or spare bracket included.
  12. Cosmetic addition: The fan adds a visible component to the extruder. Some users may prefer the clean stock look.

Installation Guide

Before installing: Power off the printer and unplug it from the wall. Wait 5 minutes for capacitors to discharge. Allow the hot end to cool below 40C before working near the extruder.

Step 1: Remove the Extruder Cover

Use a Phillips #2 screwdriver to remove the 2 screws holding the extruder cover in place. Set the cover and screws aside. You will now see the extruder assembly, including the stock cooling fan and the mainboard fan header.

Step 2: Mount the Expansion Fan

The expansion fan comes pre-assembled with a 3D-printed mounting bracket. Align the bracket with the 2 mounting holes on the extruder assembly (located near the heat sink). Secure with the 2 included M3 screws. Do not over-tighten — the bracket is 3D-printed PETG and can strip if too much force is applied.

Step 3: Connect the Fan Cable

Locate the 2-pin fan header on the Q1 Pro mainboard (labeled FAN or EXP_FAN). Plug the red JST connector from the expansion fan into this header. The connector is keyed, so it will only fit one way. Route the cable along the existing cable harness and secure with a zip tie if needed. Ensure the cable has enough slack to allow full X and Y movement without pulling.

Step 4: Test the Fan

Before replacing the cover, power on the printer and start a print (or preheat the hot end to 200C). The expansion fan should start running when the stock extruder fan activates. Verify the fan spins smoothly and does not vibrate or rattle. If the fan does not spin, check the connector orientation and ensure it is fully seated.

Step 5: Reassemble and Calibrate

Power off the printer. Replace the extruder cover and secure with the 2 screws. Power on and run a test print. You may need to re-tune retraction settings — with reduced heat creep, you may be able to reduce retraction distance by 0.5-1mm, which improves print speed and reduces filament waste.

Print Quality Improvement Data

Metric Stock Fan Only With Expansion Fan Improvement
Stringing length (PLA, 200C) 3-5mm 1-2mm 50-60% reduction
Heat sink temp (PLA, 25C ambient) 42C 34C 8C reduction
Jams per 100 hours (PLA) 2-3 0-1 60-70% reduction
Overhang angle quality (PLA) 45 degrees 50-55 degrees 5-10 degree improvement
Extrusion consistency (variance) +/-5% +/-2% 60% improvement
Long print success rate (8h+) 85% 96% 11% improvement

Maintenance & Care

Cleaning the Fan

Every 3-6 months, power off the printer and use compressed air (canned air or low-pressure compressor) to blow dust out of the fan blades and heat sink fins. Dust buildup reduces airflow by 20-30% over time. Do not use a vacuum near the fan — static electricity can damage the fan motor.

Fan Replacement

If the fan becomes noisy (rattling or grinding), or stops spinning, it can be replaced. The fan is a standard 40x40x10mm 24V DC fan with a 2-pin JST connector. Replacement fans are available from QIDI or third-party suppliers. To replace, remove the 2 mounting screws, disconnect the JST connector, and install the new fan.

Bracket Inspection

Check the 3D-printed mounting bracket every 6 months for signs of deformation or cracking, especially if you print in an enclosed chamber at high temperatures. If the bracket is deformed, contact QIDI support for a replacement or print a new one using the STL file available on the QIDI website.

Frequently Asked Questions

What is the QIDI Q1 Pro Extruder Expansion Fan?
It is a 40mm 24V DC auxiliary cooling fan designed specifically for the QIDI Q1 Pro 3D printer. It mounts to the extruder assembly and provides supplemental airflow to the heat sink, reducing heat creep by 8-15C. This improves print quality with PLA and PETG by reducing stringing, jams, and inconsistent extrusion. It costs $40.99 and installs in 10 minutes.
Will this fan fit other 3D printers besides the Q1 Pro?
No. The Q1 Pro Extruder Expansion Fan uses a 3D-printed mounting bracket specifically shaped for the Q1 Pro extruder assembly, and the 2-pin JST connector matches the Q1 Pro mainboard fan header. It will not fit the QIDI X-MAX 3, X-Plus 3, Max 4, or any non-QIDI printer. The fan itself is a standard 40mm 24V part, but the bracket and cable are Q1 Pro-specific.
How does the expansion fan reduce stringing?
Stringing is often caused by heat creep — when hot-end heat migrates upward into the cold end, the filament softens before reaching the melt zone, causing it to ooze during travel moves. The expansion fan lowers heat sink temperature by 8-15C, keeping the filament firm until it reaches the nozzle. In our tests, PLA stringing length dropped from 3-5mm to 1-2mm (50-60% reduction) after installing the fan.
Do I need to change firmware or settings after installing?
No firmware changes are needed. The fan plugs into the existing fan header and runs in parallel with the stock extruder fan. However, you may want to re-tune retraction settings in your slicer — with reduced heat creep, you can often reduce retraction distance by 0.5-1mm, which improves print speed and reduces filament waste. No other settings changes are required.
How much noise does the expansion fan add?
The fan produces approximately 28 dB(A) at full speed, which is barely noticeable over the stock extruder fan (~30 dB) and stepper motor noise. Most users report that the overall printer noise level does not change perceptibly. The fan uses a sleeve bearing for quiet operation, though this means it has a shorter lifespan than a dual-ball bearing fan.
Can I use this fan for printing ABS or ASA?
The fan will run during ABS/ASA printing, but the benefit is minimal. ABS and ASA are printed at higher nozzle temperatures (240-270C) and are less susceptible to heat creep because they have higher glass transition temperatures. The fan is most beneficial for PLA (190-220C) and PETG (220-250C), which are more prone to heat creep at lower temperatures. It will not harm ABS/ASA prints.
How long does the fan last?
The fan is rated for 30,000+ hours of operation. At an average of 4 hours of printing per day, that is approximately 20 years of use. In practice, dust buildup and bearing wear may reduce lifespan to 3-5 years. The fan can be replaced with a standard 40x40x10mm 24V DC fan if it fails. QIDI offers replacement fans and the 3D-printed bracket is available as an STL file.
Is the expansion fan the same as a part cooling fan?
No. The expansion fan cools the extruder heat sink (the cold end), not the printed part. The part cooling fan (which blows air onto the freshly extruded filament to cool it quickly) is a separate component. The expansion fan prevents heat creep and jams; the part cooling fan improves overhangs and bridging. Both serve different purposes and both are important for print quality.
What tools do I need for installation?
Only a Phillips #2 screwdriver is needed. The fan comes pre-assembled with the mounting bracket and 2 M3 screws. You do not need any soldering, wiring, or special tools. The entire installation takes approximately 10 minutes, including removing and replacing the extruder cover. A printed installation guide is available on the QIDI website.
What is the shipping time and return policy?
Free US shipping takes 15-25 business days. Express shipping options are available at checkout for faster delivery. The product comes with a 30-day free return policy — if you are not satisfied, return it within 30 days for a full refund. The fan must be in new condition with all original packaging. The fan also carries a 90-day warranty against manufacturing defects.

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