Extruder Upgrade Kit Prusa i3 MK2.5S/MK3S
This is the latest generation Bondtech upgrade for the popular Prusa I3 MK3S, with an optimized design achieved with the help of the community.
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.
Technical Specification:
Net weight : 291,5g
Gross weight : 380,2g
Package Size : 137x94x65mm
Gearing ratio : 3:1
E-steps value : 415 at 16-bit micro-stepping; or 830 at 32-bit micro-stepping
Extruder Housing: SLS Printed parts in Polyamide 12
Stepper Motor
Lightweight 25 mm pancake stepper with 18 N/m torque.
Max Input Current : 0.8A
Max chamber working temperature : 80°C
Weight Reduction
343,2g of parts coming out and 291,5g of parts coming in. A 51g (15%) weight save.
X-Carriage: Requires buying or 3D printing new X-Carriage R2 Front and Rear.
Firmware: Bondtech adapted version required. Check out the latest version of our firmware here.
Licensing: This Project is licenced under GPL V3.0 and the STEP-files are available for download.
NOTE:
- This upgrade kit is compatible only with the original All Metal V6 hotend that is supplied with each Prusa.
- This upgrade kit does not include the gears (already supplied by Prusa).
- 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.
Working Temperature Limits
Bear in mind that if you use this upgrade kit inside a closed chamber, it will have the following set of working temperature limits:
-Due to the sensor plastic parts made of HT PLA > up to 60°C (90-100°C when parts are annealed);
-Due to the stepper motor > up to 80°C.
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. It is also compatible with the MK2.5S model.
With this version we also lower the moving weight to reduce ghosting and vibrations or to allow increasing the printing speed. 15% of weight saving was achieved.
Product Main Features
- 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. For even more effective HotEnd cooling we recommend a fan with high pressure like Sunon’s MF40100V1-1000U-G99 or similar.
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.
NOTE: Update the Firmware
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.
MMU2s
To use the MMU2s together with the Bondtech an extra Add-On is required. This will allow sensor to trigger once the filament is reaching the drive gears.
You can download the STL file bundle: MMU2s Add-On for Bondtech MK2.5S/MK3S
Community involvement
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 MK2S / MK3S.
Documentation / Download Summary:
- Prusa i3 MK2.5S / MK3S Upgrade Kit - Strip Reusable Parts
- Prusa i3 MK2.5S / MK3S Upgrade Kit - Installation
- Guide for available X-Carriage
- stl-files for X-Carrriage Front and Rare:
> MK2.5S: Front
> MK3S : Front
> MK2.5S / MK3S: Rear
- STL file bundle: MMU2s Add-On for Bondtech MK2.5S/MK3S
- Bondtech Firmware Variation Updates For Prusa 3D Printers
- Bondtech Prusa i3 - Firmware Update GUIDE
