Prusa Hotend Fan MK4/3.9/XL
Prusa Hotend Fan MK4/3.9/XL
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The Hotend Fan MK4/3.9/XL is a replacement fan dedicated to cooling the heatsink of Nextruder systems on compatible Original Prusa printers. This component ensures thermal dissipation around the hotend in order to limit heat creep and maintain stable filament feed during extended FDM prints.
Designed as an original manufacturer part, it integrates directly into existing assemblies without specific mechanical adaptation. Its replacement can be carried out as part of preventive or corrective maintenance on the extrusion systems of the relevant machines.
Thermal management and maintenance
The fan provides continuous cooling of the heatsink to maintain effective separation between the melt zone and the cold zone. This thermal control is particularly important when printing materials sensitive to premature softening in the filament path.
Replacing the fan restores original cooling performance in the event of wear, mechanical noise, or rotation failure. Installation is carried out via the maintenance procedures documented by Prusa Research for each compatible platform.
Integration on Prusa platforms
This part is compatible with several generations of Nextruder systems used on the MK4, MK3.9, XL, and CORE One platforms. It is supplied as a single spare part for replacement of the original hotend fan. Several references and component variants exist depending on machine generations and assembly configurations.
Technical specifications
| Product type | Replacement hotend fan |
|---|---|
| Function | Hotend heatsink cooling |
| Compatible technology | FDM |
| Extruder compatibility | Nextruder system |
| Contents | Hotend fan |
| Installation | Direct replacement of original part |
| Use | Maintenance and repair |
Compatibility
- Original Prusa FDM 3D printers equipped with the Nextruder system
- Compatible with Original Prusa MK3.9
- Compatible with Original Prusa MK3.9S
- Compatible with Original Prusa MK4
- Compatible with Original Prusa MK4S
- Compatible with Original Prusa XL
- Compatible with Original Prusa CORE One
- Compatible with Original Prusa CORE One L
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