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A lightweight high-resolution extruder upgrade for the popular Prusa i3 MK3S and MK2.5S 3D printers with optimized design to use Mosquito and Mosquito Magnum hotends.
This Upgrade Kit does not include the gears (already supplied by Prusa).
This upgrade does NOT include a Mosquito hotend.
This Upgrade Kit requires extra parts to install (X-Carriage Kit).
You can buy it from us or you can download the STLs and 3D print them. Check download links in the Resources section.
Upgrade your extruder to a Bondtech Mini Geared with higher gear ratio – 3:1 – that allows for extra push force and higher resolution.
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 is a Bondtech upgrade for the popular Prusa I3 MK3S and MK2.5S that will allow the use of the world acclaimed Mosquito hotends.
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.
This extruder upgrade presents the following main features:
This Upgrade Kit is mostly similar to the previous MK3S, with the main difference of having been designed to fit the Mosquito and Mosquito Magnum hotends.
Other differences come from the design changes that include:
The Upgrade is compatible with the thermistor and 40w heater already supplied with the Prusa.
However, you also have the option of using Slice Engineering Mosquito thermistor and 50W heater.
We recommend the the more efficient 50W heater for your Mosquito to reach a stable operating temperature faster.
We highly recommend using a thermal compound paste to provide good thermal conductivity between the heater and the hotend. Slice Engineering recommend the use of Boron Nitride Paste.
To use this upgrade in the MK2.5S / MK3S, the E-steps and Z_Max needs to be updated. Check out the latest version of our firmware here.
We are also supplying firmware versions compatible with the use of Mosquito’s thermistor.
If you are using this Mosquito’s component you should use the related firmware.
This is a co-development work with awesome guys in the Prusa Community like Chris Warkocki, Grégorie Saunier (Bear Upgrades), Olof Ogland, Erik Bjorgan, Josh Jones, Kyle Wiehe, Marc Evertz, Matt Harrison, Ocie Ward, Sando Bendig, Vecko Kojchevski (Vecko Extruder), Steven Mölby, and Yuri Delia that have provided excellent feedback and suggestions of how to develop the “perfect” extruder setup for the Prusa series printer. A lot of work has been put in this project and we tried to listen to all the inputs in order to find a solution that can be the best fit to the Prusa I3 MK3S.
|Dimensions||13.7 × 9.4 × 6.5 cm|
Article number : EXT-KIT-69
EAN code : 7350011410675
Net weight : 378g
Gross weight : 389g
Package Size : 137x94x65mm
Gearing ratio : 3:1
E-steps value : 830
Extruder Housing: SLS Printed parts in Polyamide 12;
Lightweight 25 mm pancake stepper with 18 N/m torque.
Max Input Current : 0.8A
Max chamber working temperature : 80℃
X-Carriage: Requires buying or 3D printing new X-Carriage R2 Front and Rear;
Firmware: Bondtech adapted version required.
Licensing: This Project is licenced under GPL V3.0 and the STEP-files are available for download.
Bondtech Github. Contains Stepfile, installation manual, exploded view, and others.
The 3D printed parts of this kit can be downloaded from our server.
MK2.5S / MK3S: Click here to download the Rear.
Note! This firmware is for Mk2.5s and MK3s users with the new filament sensor.
The firmware is based on newest stable version of Prusa-firmware and support MK2.5s and MK3s users with a Bondtech extruder.
Bondtech specific changes:
Download the firmware here: