# Original Prusa i3

Original Prusa i3 MK2 3D printer printed parts

Repository: https://github.com/prusa3d/Original-Prusa-i3
Canonical: https://ross.abutalabs.com/products/original-prusa-i3
Homepage: http://prusa3d.com
Language: OpenSCAD
License: GPL-2.0
License Family: copyleft
Topics: 3d-printer, prusa-i3
Last push: 2024-03-10T20:22:37+00:00
Link (homepage): http://prusa3d.com
Link (site_page): https://help.prusa3d.com/article/shipping-information_2297
Link (site_page): https://blog.prusa3d.com/adrian-bowyer_127066
Link (site_page): https://www.prusa3d.com/page/about-us_77
Link (site_page): https://forum.prusa3d.com/forum/original-prusa-xl-tool-changer-general-discussion-announcements-and-releases/6-10-1-firmware-for-prusa-xl-xl-2?language=en

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 3906, "days_push": 906, "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 1718, forks 842 (observed 2026-08-28T04:05:26.491846+00:00)

## What it is
Open-source firmware for the Original Prusa i3 MK3S/MK3/MK2.5S/MK2.5 line of 3D printers, based on Marlin 1.0.x and written in C++ for AVR microcontrollers. It is developed by Prusa Research and distributed under the GNU GPL 3 license.

## Use cases
- flash custom firmware on an Original Prusa MK3S printer
- modify printer behavior like mesh bed leveling or filament runout handling
- build Prusa firmware from source with CMake
- contribute improvements to Prusa i3 printer firmware
- translate printer firmware into another language

## When to choose
- you own an Original Prusa i3 MK2.5/MK3-series printer and want official or custom firmware
- you want to tweak or extend printer features at the firmware level
- you need a GPL-licensed Marlin-based firmware tuned for Prusa hardware

## When to avoid
- you have a Prusa XL, MK4, CORE One, or MINI printer - those run different firmware
- you want a slicer or host software rather than printer firmware
- you need firmware for non-Prusa RepRap printers - upstream Marlin is a better fit

## Facets
- artifact type: application
- maturity: active
- function: embedded
- domain: hardware
- platform: embedded, windows
- tags: 3d-printing, firmware, marlin, reprap, avr, prusa-i3, fdm, automation, linux, macos

## Member repositories
- prusa3d/Original-Prusa-i3 (main) score 23
- prusa3d/Prusa-Firmware (backend) score 39

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:26.491846+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 2026-08-30T02:53:22.640506+00:00, confidence not recorded.
  - readme: https://github.com/prusa3d/Original-Prusa-i3 (fetched 2026-08-28T04:05:26.491846+00:00, sha 3ae510eeb7ce)
  - homepage: http://prusa3d.com (fetched 2026-08-29T10:33:38.064576+00:00, sha b3307dddb17e)
  - site_page: https://www.prusa3d.com/page/about-us_77 (fetched 2026-08-29T10:33:38.078132+00:00, sha 720942dfa14e)
  - site_page: https://www.prusa3d.com/page/information-about-cookies_231459 (fetched 2026-08-29T10:33:38.081976+00:00, sha 4d2b33d50175)
  - site_page: https://help.prusa3d.com/article/shipping-information_2297 (fetched 2026-08-29T10:33:38.073914+00:00, sha 38c53fd91ab7)
  - site_page: https://blog.prusa3d.com/adrian-bowyer_127066 (fetched 2026-08-29T10:33:38.075982+00:00, sha 44f2a27d2518)
  - site_page: https://forum.prusa3d.com/forum/original-prusa-xl-tool-changer-general-discussion-announcements-and-releases/6-10-1-firmware-for-prusa-xl-xl-2?language=en (fetched 2026-08-29T10:33:38.080142+00:00, sha 9c34cd490eab)
- Data as of 2026-08-30T08:39:29.467469+00:00.