HotFetched

Self-hosted 3D printer firmware workshop in a single Docker container. Pick a motherboard, import Marlin or Klipper source, edit the configuration through a web UI, and run confidence-gated builds where 100% means the firmware actually compiled.

Features

Marlin — full configuration editor over Configuration.h and Configuration_adv.h (~50 curated fields: machine, drivers, extruders, geometry, motion/steps/accel, kinematics incl. CoreXY, endstops, TMC currents, sensorless homing, thermal with per-thermistor limits + explicit override, displays, probes, boot image, sounds), surgical writeback that preserves your diff against upstream, staged build gates, real PlatformIO compile, and firmware.bin + config-bundle export.

Klipper — board-seeded MCU firmware build (make olddefconfig && make) producing klipper.bin, plus a generated printer.cfg from the board's reference config with your geometry, speeds, and TMC currents applied.

Sound designer — power-on tune baked into Marlin firmware, per-event M300 host G-code, browser piezo preview, RTTTL/MIDI/audio melody import, format export (.mid/.rtttl/.txt), and a searchable 11,000-melody library (ldrolez/free-midi-chords, MIT).

Boot images — any PNG/JPEG dithered to a 128x64 1-bit _Bootscreen.h with live preview.

Supported boards

Anything under 100 shows exactly which gate failed and why.

Support

HotFetched is free and self-hosted. If it saved you time or a bricked board, you can support development here:

https://ko-fi.com/bloodthirstycheeseburger90415

License

MIT. Sound library: ldrolez/free-midi-chords (MIT).