# gregsaun/prusa_i3_bear_upgrade

Stronger frame for Prusa i3 MK2(s), MK2.5 and MK3

Repository: https://github.com/gregsaun/prusa_i3_bear_upgrade
Canonical: https://ross.abutalabs.com/products/prusa_i3_bear_upgrade
Language: Shell
License: GPL-3.0
License Family: copyleft
Topics: prusa-i3-mk2, openbuilds, prusa, prusa-i3, prusa-bear-upgrade, extrusion, haribo, zaribo, prusa-i3-mk2s, prusa-i3-mk3, fusion-360, 3d-printing, 3d-printer
Last push: 2023-07-08T09:54:09+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 3268, "days_push": 1152, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1019, forks 341 (observed 2026-08-28T04:03:15.043954+00:00)

## What it is
An open-source hardware project providing a stronger aluminum extrusion frame upgrade for Prusa i3 MK2/MK3 3D printers, including printed part files, bill of materials, and assembly guides. It improves stiffness, print speed, and precision while reusing most stock printer parts.

## Use cases
- upgrade my Prusa i3 MK3 to a stiffer frame
- make my Prusa MK2 print faster and more accurately
- find printed parts and BOM for a Bear frame upgrade
- convert my Prusa i3 to aluminum extrusion frame
- reduce noise and improve precision on my Prusa printer
- build a BearExxa or Bondtech extruder setup on a Bear frame

## When to choose
- you own a Prusa i3 MK2(S), MK2.5, or MK3(S/S+) and want a sturdier frame
- you want an open-source, well-documented hardware upgrade with active community support
- you plan to customize your printer with alternative extruders like BearExxa or Bondtech

## When to avoid
- you don't own a compatible Prusa i3 printer
- you want a plug-and-play upgrade without sourcing extrusions and hardware
- you need a software or firmware project rather than a hardware design

## Facets
- artifact type: application
- maturity: maintenance
- function: simulation, developer-tools
- domain: hardware, self-hosted
- platform: cross-platform
- tags: 3d-printing, prusa-i3, hardware-upgrade, openbuilds, fusion-360, 3d-printer-frame, automation

## Member repositories
- gregsaun/prusa_i3_bear_upgrade (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:15.043954+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:09:22.908462+00:00, confidence not recorded.
  - readme: https://github.com/gregsaun/prusa_i3_bear_upgrade (fetched 2026-08-28T04:03:15.043954+00:00, sha 1ea7fff800d6)
- Data as of 2026-08-30T08:39:29.467469+00:00.