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Genuine Bondtech Prusa I3 MK2.5S / MK3S / MK3S+ Extruder Upgrade (EXT-KIT-68)

4.8 (1) Write Review
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$124.99

$ 53 .99 $53.99

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  • This is the latest generation Bondtech upgrade for the popular Prusa I3 MK3S, with an optimized design achieved with the help of the community.
  • This kit contains only the necessary parts to convert your current extruder to our own popular design based upon our BMG (Bondtech Mini Geared) extruder with 3:1 gearing ratio for better precision and resolution together with optimized geometry for the heatsink cooling and professional SLS 3D printed housing.
  • Use a lightweight extruder that will allow your 3D printer to print faster or to achieve better surface quality.
  • Decrease the risk of heat creep to avoid clogs and improve filament feeding to avoid slipping and deformation that cause under and over extrusion issues.
  • This Upgrade Kit does not include the gears (already supplied by Prusa). This Upgrade Kit requires extra parts to install (X-Carriage Kit).


A lightweight high-resolution extruder upgrade for the popular Prusa I3 MK3S 3D printers, featuring an optimized design achieved with the help of the community. This upgrade kit is compatible only with the original All Metal V6 hotend that is supplied with each Prusa. This extruder upgrade kit is for the Prusa i3 MK2.5S / MK3S / MK3S+. Main features include: Adapted to fit Prusa’s new filament sensor; Includes one Bondtech’s BMG extruder with 3:1 gearing ratio; Optimized geometry for heat-sink cooling; Less moving weight to reduce vibration and ghosting; Professional SLS 3D printed housing. The enhanced housing design improves cooling and decreases heat creeping issues that all metal hotends have when printing with PLA. This small enhancement will avoid many clogs. The increased push force will drastically reduce slipping, shredding and deformation of the filament avoiding most of the common filament 3D printing issues that start with under and over extrusion.


Jonathan Delgado
Reviewed in the United States on March 15, 2023
The back of the extruder has holes in different places, so it is not possible to secure it to the Genuine Bondtech, the wholes where the belt is secured. In the tutorial, there are holes right below the belt secure line, but in the Prusa i3 MK3S+, this is not the case, the holes are below it. I guess you could make the holes yourself but it's a hassle.