- Introduction
- Project Status
- Disclaimer
- Design Goals
- Compatibility
- Bill Of Materials
- Printed Parts
- Print Settings
- Assembly Guide
- Configuration
- Optional Parts
- Community
- Support My Work
- Credits And Thank you
- License
This is the repository for the Bear EXtruder and X Axis Version 2 (BearExxa V2). It consists of an extruder and X axis designed to improve Prusa MK2.5(S, S+) and MK3(S, S+) print quality, speed, reliability and usability. It's the successor of the Bear Extruder and X axis V1. Like the previous extruder, it's fully open source.
Status: Currently building the repository for the Beta release
This project is on hold for now. It's provided "as is" for any adventurous users interested in having a good extruder for their Prusa or Bears. The Beta version of the BearExxa V2 provided here at the moment is fully functional and safe to use. The end goal is to provide a kit with all the parts and an improved stepper for better print quality and reliability (see Design Goals)
This project is only to provide an alternative extruder and X axis to your Prusa printers. We are not related to Prusa Research. We cannot be taken responsible for any damages you may do by using this project nor any decision Prusa would take on you (for example: loosing warranty). This project is not for beginner and is at your own risk.
The main goals of the BearExxa V2 are to focus on print quality, reliability, usability, precision, speed and to solve the inconsistent extrusion issue (602 issue).
➡️ Read the detailed design goals here
The BearExxa V2 is compatible with both Original and Bear frames of Prusa MK2.5(S, S+) and MK3(S, S+).
The stock Prusa firmware is supported with the following conditions:
- Self tests and XYZ calibrations need to be done with the Bear calibration firmware. All the normal printing routines, including first layer calibrations, will work as normal with the stock Prusa firmware. Note that you can also safely use the Bear calibration firmware for printing daily
- The thermal algorithm for the hotend introduced in the very latest Prusa firmwares can sometimes cause issues with the fast Revo heating. There are commands to use the previous standard method (we provide the documentation to do it)
- For the beta release only: you will need to disable fan checks for prints and temporarily plug the stock hotend fan during self test procedure. The final version will be sold as a kit with a compatible fan and this will not be needed anymore
Important
This is the firmware we recommend for the best safeties and to keep all the functionalities provided by the Prusa firmware. We can provide full support to our customers with this firmware.
The final release of BearExxa V2 will not disable or affect any safeties from the original Prusa firmware (and same applies for the Bear calibration firmware). The E3D Revo hotend is actually providing an extra safety in case of thermal runaway compared to the E3D V6 used in the Original Prusa.
Important
We can only provide limited support to these firmwares.
The BearExxa V2 is also compatible with the Prusa AIO Marlin 2.x firmware. This firmware can run on some 32b boards. Thanks Keith for this impressive work!
We will provide main Klipper parameters for the final version of BearExxa V2.
The BOM includes the list of printed parts and all hardware you need to build the BearExxa V2.
Tip
All links here correspond to the latest release.
Warning
It's important to follow the recommended print settings and to calibrate your extrusion multiplier before printing the parts (for each and every spool that you use). Check our calibration guide here.
to do
Warning
It's important to follow the recommended print settings and to calibrate your extrusion multiplier before printing the parts (for each and every spool that you use). Check our calibration guide here.
➡️ Read the print settings here
As this is only a beta version provided "as is" we only have a quick assembly guide.
➡️ Read the quick assembly guide for beta version here
Before using your BearExxa V2 you need to configure the printer.
➡️ Read the configuration documentation here
to do
Here are the places where the Bear project is the most active on:
- Discord server of "The 602 Wasteland" community : discordapp.com/invite/hYUjSnW
- Twitter : @gregoiresaunier
- Mastodon : fosstodon.org/@bear_lab
- GitHub : github.com/gregsaun
Do not hesitate to ask if you have a question.
The bear project is made possible thanks to its supporters. You can participate via
- Patreon: patreon.com/gregsaun
- PayPal: paypal.me/gregsaun
- GitHub Sponsor: github.com/sponsors/gregsaun
Massive thank you in advance ❤️
- The close help of Florian Däubler, Paul_GD, Schaun Doe, Sleene and vertigo235
- All my Patreons, it would have been impossible without their help
- LDO Motors for their continuous and precious support. Thanks to LDO, we plan to make a full kit with custom stepper
- E3D Online for providing a free hotend for development and answering my questions
- The fan duct knob by Amelia Marie Collins
- René Jura for helping me on CFD simulation for the nozzle fan duct
- The 602 Wasteland Discord community for their precious knowledge, advice and great talks
- Keith Bennett for making the Prusa AIO firmware compatible
- PoiTEE for the great talks and testing
- FilamentFrenzy for having tested and make noise for an early version of BearExxa v2
- Prusa Research for their MK2.5S and MK3S designs
- Adrian Bowyer for creating RepRap
The Bear Extruder v2 is an open-source hardware project created from scratch by Grégoire Saunier with help and inspiration from the people and companies listed under "Credits and Thank You" as well as contributions linked to this repository.
All texts, images, PDF files and animations in this repository are licensed under the terms of the CC-BY-SA 4.0 license. The full license text of CC-BY-SA 4.0 is available in this repository at ./LICENSE-CC-BY-SA-4.0. Read more about this license here.
All content in this repository, except for texts, images, PDF files and animations is licensed under the terms of the CERN-OHL-P v2 license. The full license text of CERN-OHL-P v2 is available in this repository at ./LICENSE. Read more about this license here.