SKU: 20211361452

Bondtech Prusa I3 MK3S Extruder Upgrade Kit EXT-KIT-68

Sale price$135.90 Regular price$151.00
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Ships within 48 hours · Estimated delivery Jul 19 - Jul 24

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Description

Bondtech Prusa I3 MK3S Extruder Upgrade Kit EXT-KIT-68Looking for a Bondtech MK3S Extruder Upgrade Kit in Australia? 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 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

Looking for a Bondtech MK3S Extruder Upgrade Kit in Australia?

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 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.

LIGHTWEIGHT BMG (BONDTECH MINI GEARED)

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

This extruder upgrade kit is for the Prusa i3 MK3S, or other Prusa i3 models upgraded to MK3S.
These are its 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.

    ADDRESSING 3D PRINTING ISSUES

    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.

    UPDATING THE FIRMWARE

    To use this upgrade in the MK3S, the E-steps needs to be updated to 830, as it uses 32-bit micro-stepping. Use this file instead.

    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 MK3S.

     

    STEPPER MOTOR

    Lightweight 25 mm pancake stepper with 18 N/m torque.
    Max Input Current : 0.8A
    Max chamber working temperature: 80℃

    Weight Reduction:
    343,2g of parts coming out and 291,5g of parts coming in. A 51g (15%) weight saving.

    CONTENTS OF THE  X-Carriage KIT includes:

    • X-Carriage Front
    • X-Carriage Rear
    • 5x M3x10 Screws
    • 5x M3 square nut
    • 1x M3 nut

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      Shipping Notes
      • Free Standard Shipping on $100+ Orders to the USA.
      • Except Preorder products are shipped in 48 hours.
      • Delivery to the USA:
      1. Standard Shipping : 3-10 business days
      • If time is of the essence, please consider selecting expedited delivery for faster service.
      Exchange/Return Notes
      • We offer a 30-day return/exchange service after receiving.
      • Final sale items are not eligible for returns or exchanges.
      • To process your return/exchange, please contact us at [email protected]
      • Please click here for more details>>> Return & Exchange Policy
      SKU: 20211361452

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      Madi R.
      Chelsea, US
      ★★★★★ 4
      Overpriced but effective.
      Color: Cream
      I happened to get lucky and get a warehouse deal at an additional 30% discount. Even at $25, it feels a little overpriced. But it was easy to assemble and serves its purpose. If you line the Velcro up exactly, the panels sag, if you stretch past even, but where it still grips, they look pretty ok. It is very light and does fold very compact for easy storage.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on April 3, 2026
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      Sunny in AZ
      Port Orchard, US
      ★★★★★ 5
      Great price for a great product
      Color: Coal Black
      Excellent quality and great price to boot. Easy to assemble and folds up easily to be stored. We are using it as a privacy screen when we have company that needs to sleep on the couch and also to block off a hallway leading to a guest suite. It looks great and is as described in the ad
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      Reviewed in the United States on December 16, 2025
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      Carissa L
      Carnegie, US
      ★★★★★ 1
      No.
      Color: Coal Black, Color: Coal Black
      This was horribly made and a nightmare to put together. You have to basically bend the bars to get the coverings attached. The sizes don't match. The stickers that label the parts are impossible to remove and if you do get them off theres a lot of residue left behind. On top of that once it was put together I noticed theres a big dirty foot print on it which is definitely not mine.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on January 5, 2026
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      Duckie mom
      Bozeman, US
      ★★★★★ 3
      You have to add weight to it
      Color: Coal Black
      It does its job and it was easy to put together but it's a little on the flimsy side and it will easily be knocked down. So you're going to have to figure out a way to make the legs heavier? I used cinder blocks, single cinder blocks and it works just fine. Just know that it will knock over super easy
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      Reviewed in the United States on January 22, 2026
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      Oneida P
      Alexandria, US
      ★★★★★ 5
      The snap to put them together.
      Color: Coal Black
      This came in handy in the foyer. I didn’t want to see the door from my couch. I must be weak found it hard to snap them together. I kept 2 my daughter took the other 2.
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      Reviewed in the United States on May 19, 2026

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