Project Overview

If you are not sure which parts to print, which assembly to follow or what BOM applies to your upgrade, you are at the right page. This guide explains what applies to which version of your printer/upgrade.

We invite you to consult our FAQ or the official Prusa knowledge base for more information.

Status: stable

The Bear Frame Upgrade improves stiffness and reliability of the original Prusa i3 MK2(S), MK2.5(S) and MK3(S). It allows faster prints, increases precision, makes maintenance easier and opens the door to more customization. Plus it looks unique with our colored frames!

- Bear Frame 2.1 Upgrade

Status: stable

This is a better extruder and X axis for Prusa i3 printer MK2.5S and MK3S. It is a following of the Bear Upgrade project and is still compatible with original Prusa's 3D printers.

The main goal of this extruder is to improve print quality, reliability and make maintenance easier.

⚠️ The Bear X axis is NOT compatible with stock Prusa extruder!

- Bear extruder page

Status: beta available to Patreons

This is a improved extruder and X axis V2 for Prusa i3 printer MK2.5S and MK3S. It is a following of the Bear Upgrade project and is still compatible with original Prusa's 3D printers.

The main goal of this extruder is to reduce prints artifacts, reduce weight and use latest generation of hotends.

⚠️ The Bear X axis is NOT compatible with stock Prusa extruder!

- Bear extruder page

Status: stable

This page contains all the files and information to use the Bear X axis with the original E3D Hemera.

The Hemera needs a dedicated mount to be used with the Bear X axis. All hardware and printed parts needed are available in the Bill of Materials section below.

- BearMera page

Status: stable

This section contains all the files and information to use the Bear X axis with the original Bondtech Prusa Upgrade Extruder MK2(S), MK2.5(S), MK3(S), Mosquito MK2.5(S), Mosquito MK3(S).

The original Bondtech Prusa Upgrade Extruder needs a dedicated Bear X carriage to be used with the Bear X axis. You can find this special Bear X carriage and all hardware/printed parts needed in the Bill of Materials section below.

- Bondtech page

Status: development in progress. It is too early to share files and BOM as of today.

We are working on a linear rail Y axis for the Bear Upgrade frame. It will be a single centered rail to make assembly easy and to avoid problems due to the tight tolerances of linear rails. It will be compatible with the Bear Upgrade 2.1 frame, no extrusion will need to be modified.

Status: development in progress

We are working on having a Duet adaptation which will support Bear Extruder V2 as well as all Bear Frame.