SKU: 20211361452

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

Sale price$135.90 Regular price$151.00
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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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      4.3 ★★★★★
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      Nathan Tucker
      Grantham, US
      ★★★★★ 4
      X-Large is about a size 12-13 shoe size foot USA.
      Material Type: Black - 3 Pairs, Size: X-Large
      I love them they work fantastic. I am a big guy with swollen feet. Wear size 12 to 13 USA Shoes. They fit me just fine not tight. My feet felt good after wearing them for two days. Some dry skin pulled off with them and it says to wash by hand. I dont know about the durability but I am hoping to get about 5 uses per pair. Before they become unusable.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on February 7, 2026
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      Y K
      Waukegan, US
      ★★★★★ 5
      Comfortable
      Material Type: Black - 2 Pairs, Size: X-Large, Material Type: Black - 2 Pairs, Size: X-Large
      I have very sensitive skin, so I usually need to wear socks at all times. These are especially comfortable because they don’t cover the toes, which helps with temperature control. The material is well-balanced—not too thick or too thin—and has just the right amount of stretch. I also appreciate the large traction area, which adds stability. Another plus is that they are completely fragrance-free.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on April 21, 2026
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      Pudatane
      Belleville, US
      ★★★★★ 5
      Great Heel Socks
      Material Type: Black - 3 Pairs, Size: Large
      I don't know how they work but it's wonderful. I've had rough heel problems for a long time. I wear these everyday and my heels are not rough. They're not baby bottom smooth, but they are not ever going to be. These heel socks also oncce they are properly positioned snap onto the heel. Properly positioning them is easy when you put them on your foot with the heel cup in the correct orientation.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on April 14, 2026
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      beachx
      Massapequa, US
      ★★★★★ 3
      Too small
      Material Type: Gray - 3 Pairs, Size: X-Large
      Too tight! Even size large used for a man with smaller feet is too tight. Also, no instructions for use or care.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on May 21, 2026
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      Jo-Ann Epstein
      Louisville, US
      ★★★★★ 5
      Good fit
      Material Type: Black - 3 Pairs, Size: X-Large
      My husband just started using these and they feel comfortable. Hasn't used them long enough to see if his heels are better. He has a high arch so I bought him the XL and they fit perfectly.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on April 24, 2026

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