config.env.example opened with DESKTOP="$HOME/Desktop", and four settings hung off it. Nothing in bin/, pkgs/, qa/ or installer/ ever read it: three of the four were commented-out overrides for files `make vendor` already fetches, and the fourth, BUSYBOX_BIN, names a binary with no source at all. What DESKTOP really did was carry the stock FlashForge .tgz -- the one input a person had to go and find before they could build anything. It did not have to be. .github/workflows/ci.yml has been fetching that exact file for as long as printer-sim has run, from ghzserg/FF, pinned by sha256, with its own get(), its own cache and its own secrets -- a second spelling of "download the firmware and check the hash" that no human path shared. The pins here are those pins, verified byte-for-byte against a fresh download of both assets. So versions.env pins the stock package the way it pins everything else, bin/fetch-assets.sh downloads it into vendor/, and bin/common.sh defaults STOCK_TGZ_* there. A cold checkout is now `cp config.env.example config.env && make build`, with nothing to edit. --stock is a separate flag from --all, not folded into it. The packaging lane wants no FlashForge package -- that is most of the point of it being runnable in CI on a bare checkout -- so `--all` stays "every payload piece, no firmware", `make build` asks for the one model it is building, and `make vendor` (--all --stock) takes both. The one download that will not overwrite an override. HELIX_TGZ and friends name a public release anyone can re-fetch in a minute; STOCK_TGZ_* names 93MB of proprietary firmware someone downloaded by hand, and clobbering it on a hash mismatch would destroy the only copy on the machine. It is skipped instead, and unchecked -- their file, their problem. CI loses its duplicate fetcher, its stock/ cache and the STOCK_URL_* secrets. A fork testing its own firmware re-pins versions.env, which works locally too; the secrets only ever worked in CI. qa/lib/config.py reads versions.env for the pinned filenames so stock_for() looks where the download actually lands. An explicit STOCK_TGZ_* still wins. An existing config.env keeps working untouched: its paths are now overrides, so the build skips the download and uses the file it always used. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DPU6RR4UJH2Qf9DR5hb2gg
Reforge
Custom firmware for the FlashForge Creator 5 and Creator 5 Pro.
It installs the way a normal FlashForge update does: copy one file to a USB stick, plug it in, power the printer on. No jailbreak, no soldering, no opening the case, no ssh needed to get started — the printer's own updater does the work.
Packages are published on the Releases page — two files per release, one per model, marked pre-release while the mod is young. Help and support: the Discord.
Unofficial and unaffiliated with FlashForge. It voids your warranty and you are responsible for your machine. See Status for what has actually been tried on hardware before you flash anything.
Status
It runs on a real printer — a Creator 5 Pro, flashed and printing:
A checked box happened on that machine; an empty one has not, yet.
For everyone:
- Install and migration from stock firmware — the printer's own updater does it; your unit's factory calibration imports itself on the first boot
- Printing — gcode straight from the slicer, nothing edited
- Toolchanges — a current Klipper with real toolchanger support, in place of the 0.12-era tree FlashForge ships
- Nozzle-offset calibration
- Mainsail at
http://<printer-ip>/, with a current Moonraker behind it — anything that speaks the Klipper API works - Camera — mjpg-streamer, already on the printer; the mod just starts it
- Wifi
- HelixScreen on the printer's own screen
- Chamber heater
- Creator 5 (non-Pro) — its package builds and passes the same replica test suite, but has not touched hardware
- Going back to stock — proven on the printer replica, not yet needed on the machine. The stock package restores everything it carries; Moonraker is not in it, so the mod's build stays and keeps working — see Support
For the tinkerer:
- ssh as root — a random password is chosen on the first install
and written to
anvil-password.txton your stick; updates keep it (make passwdbakes in your own)
What you give up
FlashForge's application is one binary, and replacing it takes everything
that lived inside it: the network API on :8898, and with it FlashPrint,
Orca's FlashForge profile and the mobile app. Moonraker's API takes over.
Flashing the stock package brings them back.
If your prints already come out the way you want and you like the printer's own screen, this mod is not for you. It trades FlashForge's polish for Klipper's reach, and it expects you to be comfortable with a Klipper config and an ssh session when something breaks — Is this for you is the honest version of that question.
Get it
Creator 5 and Creator 5 Pro are not interchangeable. The printer refuses a package built for the other model — the most common reason a flash "does nothing". Yours is in Settings → About.
| Your printer | The file on the Releases page |
|---|---|
| Creator 5 | Creator5-anvil-<date>.tgz |
| Creator 5 Pro | Creator5Pro-anvil-<date>.tgz |
Download the stock FlashForge package for your model before you begin. It is the undo button: flashing it back puts the printer as it was.
Start here
| Is this for you | Who should flash this, who should stay on stock, and what it asks of you |
| Installing | The flash, the first boot, your root password |
| Your first print | The go/no-go checks, calibration, and the two verification files |
| Support | The logs, and the way back to stock |
The full manual is at
reforge.readthedocs.io. If you want the
insides — one file, firmwareExe, with the stock boot scripts, updater and
recovery path left untouched — How it works is under
For contributors.
Credits
Built on the work of others: ghzserg/FF publishes the stock packages and factory image everything here starts from; Mainsail, Moonraker and HelixScreen are shipped as released; the toolchanger status API follows viesturz/klipper-toolchanger so tool-aware UIs work unchanged.

