Best 3D Printer Part Cooling Fan (2026): 4010 and 5015 Blower Upgrades
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A noisy hotend fan is a worn fan. A 4010 or 5015 blower swap fixes the rattle, restores overhang cooling, and costs less than a new printer. Pick the right size for your hotend first.
Our picks
The part cooling fan is the small 40 mm or 50 mm fan on the hotend and on the cooling duct above the nozzle. It is the part most people ignore until prints start looking fuzzy or the hotend sounds like a coffee grinder. A fresh fan restores the rattle-free hum, holds the overhang cooling curve, and costs less than a new printer. The hard part is picking the right size for the hotend.
This guide is for the swap. For the nozzle that the fan pushes air past, see the 3D printer nozzles pillar. For the all-metal hotend the fan keeps cool, see the all-metal hotend upgrade guide. For the wrench and the bench kit, see 3D printer tools kit.
When a fan swap actually fixes something
Most hotend fans are not broken when they ship. They are not great either. Sleeve bearing fans in particular develop play within a year of regular printing. The fan starts to rattle, the bearings warm up, and the airflow at the heat sink drops. The hotend climbs in temperature and the printer throws a thermal runaway warning.
A fan swap fixes the rattle, restores the airflow, and removes the thermal warning. Owners who keep spare fans in the drawer usually describe the swap as the quietest twenty minutes of printer maintenance.
The other reason to swap is overhang quality. Stock fans on Ender-class machines often run at a conservative RPM so the printer is quiet. A higher RPM blower with the same form factor moves more air at the same voltage. Overhangs, bridges, and small details cool more cleanly. The trade is noise. Tweak the slicer fan curve after the swap.
Match the fan to the hotend before you order
Most fans look the same from the box. They are not. The size and the connector matter more than the brand.
- 4010 axial fan on the heat sink of stock Ender 3, Ender 5, CR-10, Kobra 2, and most open-frame hotends
- 4010 blower fan on the cooling duct that points air at the part
- 5015 blower fan on tight hotends like the Sprite, Micro Swiss NG, Voron tool heads, and many BMG-style extruder shrouds
- 2510 axial fan on smaller hotends like the Ender 3 V3 KE and SE extruders
A wrong size fan will not seat against the heater block. It rattles, vibrates, and may contact the heater wires. Measure the cavity before you order. The hotend photo on the printer product page usually names the fan size.
Match the voltage too. Most modern boards are 24V. Older Anet boards and some Kobra Go boards are 12V. The stock fan label tells you which. A 12V fan on a 24V board burns out within minutes; a 24V fan on a 12V line just spins slowly and cools nothing.
Quick comparison
Best official 4010 swap: Creality
The Creality Official Ender 3 Fans pack is the OEM 4010 axial and 4010 blower in one box, sized for Ender 3, Ender 5, and CR-10 boards. It is the boring pick that works.
The 4-pin connector matches the stock wiring so the swap is unplug, swap, plug, no soldering. The pack includes both the heat sink axial fan and the part cooling blower; a noisy hotend usually means both fans are tired, and replacing only one leaves the rattle half-fixed. Owners on Ender 3 boards report the printer dropping a few decibels within ten minutes of installation.
The fan is not the highest RPM option. If overhangs are the reason you are swapping, see GDSTIME below. The Creality pack is for the boring fix: bring the printer back to factory airflow and quiet, then move on.
Choose Creality when you want a like-for-like OEM swap that does not need a printed bracket. Skip it if your hotend is not a stock Ender-class block; the connector and the bolt pattern do not fit a Sprite or a Voron tool head.
Best 5015 blower pack: WINSINN
The WINSINN 5015 Blower Fan 4-pack is the popular small blower that fits where a 4010 will not. The 50 mm by 50 mm by 15 mm form factor matches the Sprite extruder, the Micro Swiss NG direct drive, and most Voron tool heads.
The 5500 RPM turbine delivers real pressure at the same 24V most boards ship. The pack includes four fans, which matters because the first swap usually teaches you the install; the second swap is where the spare pays for itself. The hydraulic bearing is rated for 35,000 hours, which is years of regular printing.
The connector is 2-pin XH2.54. Check that your board has the matching header before you click buy. Voron and Sprite boards ship with the right header. Some generic Creality boards do not, and an adapter or a re-pin is the workaround. Do not force the fan onto a wrong connector.
Choose WINSINN when the cavity is too tight for a 4010 and you want a known brand at the lowest price per fan. Skip it when a stock 4010 fits; the 5015 is not a better axial substitute, just a smaller blower.
Best high-speed upgrade: GDSTIME
The GDSTIME 9500 RPM 4010 Blower is the upgrade when the part cooling duct on the slicer is set to 100 percent fan and overhangs still droop. The 9500 RPM spec at 24V matches what most homemade cooling ducts target.
The dual ball bearings are rated for 50,000 hours, so the fan stays quiet long after a stock sleeve bearing fan has rattled. The 1 m cable reaches the board without splicing. The 2-pin connector matches most Creality and Voron headers.
The trade is noise. At full speed the GDSTIME is louder than a stock Creality blower. Owners usually drop the slicer fan curve from 100 percent to 70 percent for PLA jobs and 100 percent only for bridges and the first few layers of overhangs. The fan still moves more air than a stock fan at 70 percent because the RPM ceiling is higher.
Choose GDSTIME when overhangs and bridges are the actual problem and you have already printed a duct that points the fan at the nozzle. Skip it as a stock replacement; the noise trade is real and the OEM Creality fan is the calmer choice for a normal swap.
How to swap the hotend fan without wrecking the wires
- Power off the printer and let the hotend cool to room temperature
- Unplug the fan connector from the board; do not pull on the wires
- Remove the two screws that hold the fan to the heat sink or shroud
- Seat the new fan in the same orientation; the airflow arrow on the fan body should point at the heat sink fins
- Reconnect the fan to the board and run a quick test print to confirm the fan spins
- Tighten the shroud screws only after the fan is plugged in and verified, so the wires are not twisted
If the wires are tight against the heater block, loosen the board-side connector and reseat it with the wires routed away from the block. A silicone socks for 3D printers cover over the heater block keeps a melted filament blob from welding the wires to the aluminum. Keep a spare sock in the same drawer as the spare fans.
Signs the fan is the problem, not the slicer
A noisy fan is the easy clue. The other clues are quieter:
- The printer throws a thermal runaway warning on the first long print after a quiet period
- Overhangs above 45 degrees droop or roughen on stock profile settings
- The first layer looks fine but layers 20 and up look fuzzy or uneven on the same print
- Cold pulls come out clean but underextrusion remains on the next print
If a needle and a temperature bump do not help, replace the fan. Fans are cheaper than another weekend of slicer experiments. A spare fan in the drawer is the cheapest insurance on a busy bench.
Bottom line
Pick the Creality Official 4010 Ender 3 Fans when you want a like-for-like OEM hotend swap on Ender 3, Ender 5, or CR-10 boards.
Choose the WINSINN 5015 Blower Fan 4-pack when the hotend cavity is tight like a Sprite, Micro Swiss NG, or Voron tool head and you need a smaller blower.
Take the GDSTIME 9500 RPM 4010 Blower when overhangs and bridges still droop on a stock fan and you want more pressure on the same 24V line.
Match the size and the voltage before you order, route the wires away from the heater block, and keep a spare in the drawer so the next rattle is a twenty-minute fix, not a weekend.
Frequently Asked Questions
What size fan do I need for a 3D printer hotend?
Most Ender, CR-10, Kobra, and Neptune hotends use a 4010 axial or blower fan, which is 40 mm by 40 mm by 10 mm. Tight hotend cavities like the Sprite, Micro Swiss NG, and Voron tool heads use a smaller 5015 blower (50 mm by 50 mm by 15 mm). Measure the cavity and check the listing photo before you order. A wrong size fan will not seat and will rattle against the heater block.
Why does my stock hotend fan sound so loud?
Sleeve bearing fans wear out within a year of regular printing. The bearings develop play and the fan starts to rattle. A dual ball bearing fan rated for tens of thousands of hours is the fix. Owners usually describe the difference as the printer going from a desk rattle to a quiet hum once the new fan is in.
Will a higher RPM fan improve overhangs?
Often yes. A 9500 RPM 4010 blower moves more air at the same voltage than a stock 4000 RPM fan. Overhangs, bridges, and small details cool more cleanly. Watch the slicer fan curve; if you set 100 percent fan on every layer the new fan will be loud and may pull heat out of the hotend. Tweak the curve after the swap.
Can I run a 12V fan on a 24V board?
No. A 12V fan on a 24V line burns out within minutes. A 24V fan on a 12V line just spins slowly and cools nothing. Most modern Ender, Kobra, and CR-10 boards run 24V fans; older Anet and some Kobra Go boards run 12V. Check the board label or the stock fan label before you order. A buck converter is the workaround, not the default.
Do I need a new fan shroud when I swap the fan?
Usually no. A 4010 fan in a 4010 shroud seats the same. If you swap to a different size, like a 5015 blower in a 4010 mount, you need a printed adapter or a new printed shroud. Slicers publish common shroud STLs that match specific hotends. Print the adapter before you order the fan so the swap is one evening, not a week of waiting.
Will a 4010 blower help with stringing?
Indirectly. Better part cooling lets you drop the hotend temperature a few degrees and stay consistent at the same retraction settings. The fan does not replace dry filament. If your PLA or PETG is stringing despite a healthy fan, dry the spool and recheck. See how to dry filament for the routine.
Can I use a PC fan on a 3D printer?
Most PC case fans run on 12V and use a 3-pin connector. They will physically fit a 4010 mount, but the voltage and the pinout are wrong for most printer boards. Stick with 24V fans listed for 3D printer hotends. The labels and the bearing ratings are tested for the heat.
What is the difference between an axial fan and a blower fan?
An axial fan moves air along the axis of the fan, like a desk fan. A blower fan moves air perpendicular to the axis, like a hair dryer on the side. Hotend cooling wants axial airflow along the heat sink fins. Part cooling wants a blower that points sideways at the nozzle to push air at the printed part. Most hotend swaps use the same form factor and the difference matters more on the cooling duct than on the hotend itself.