MarlinFirmware/Marlin

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Marlin is a firmware for RepRap 3D printers optimized for both 8 and 32 bit microcontrollers. Marlin supports all common platforms. Many commercial 3D printers come with Marlin installed. Check with your vendor if you need source code for your specific machine.

Stars: 17.6k
Forks: 19.7k
Open beginner issues: 1
Indexed issues: 663
Avg merge: 3d 5h
Merged PRs (30d): 21

Dominant language: C++
License: GPL-3.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

Beginner friendly Everything

Open All

663 open issues indexed

[FR] Pre-heating Bed/Nozzle notice when using the Z-Probe Wizard Open

T: Feature Request

Difficulty 3/5 1-2 days Newbie friendliness 55/100

MarlinFirmware/Marlin#28584 · 2 comments · Opened Sep 16, 2026
[BUG] Hotend fan is not running when hotend heats up Open

Bug: Potential ?

Difficulty 4/5 3-5 days Newbie friendliness 42/100

MarlinFirmware/Marlin#28582 · Opened Sep 13, 2026
[BUG] Stable 2.1.x regression: CardReader::diveToFile() uses an unterminated dosSubdirname Open

Bug: Potential ?

Difficulty 1/5 Under an hour Newbie friendliness 92/100

MarlinFirmware/Marlin#28579 · Opened Sep 13, 2026
[BUG] MKS Robin E3 V1.1: I2C EEPROM failures with mks_robin_e3 STM32duino environment; Maple passes identical stress test Open

Bug: Potential ?

Difficulty 4/5 3-5 days Newbie friendliness 45/100

MarlinFirmware/Marlin#28576 · 2 comments · Opened Sep 12, 2026
[BUG] Display on SPI Interface seperate from SD does not work Open

Bug: Potential ?

Difficulty 4/5 3-5 days Newbie friendliness 48/100

MarlinFirmware/Marlin#28569 · Opened Sep 10, 2026
[BUG] Bed Level offset wrong on first level. Second level corrects offset Open

Bug: Potential ?

Difficulty 4/5 3-5 days Newbie friendliness 48/100

MarlinFirmware/Marlin#28489 · 10 comments · 1 reaction · Opened Jul 19, 2026
[BUG] Auto-leveling is not working properly. Open

Bug: Potential ?

Difficulty 4/5 3-5 days Newbie friendliness 38/100

MarlinFirmware/Marlin#28478 · 6 comments · Opened Jun 30, 2026
[BUG] FILAMENT_CHANGE_RESUME_ON_INSERT does not automatically continue after filament insertion Open

Bug: Potential ?

Difficulty 3/5 1-2 days Newbie friendliness 48/100

MarlinFirmware/Marlin#28473 · 1 comment · Opened Jun 27, 2026
[Configuration/LCD] Add standalone configuration defaults and LCD menu controls for Non-Linear Extrusion parameters (A, B, and C) Open

T: Feature Request

Difficulty 3/5 1-2 days Newbie friendliness 68/100

MarlinFirmware/Marlin#28463 · 1 comment · Opened Jun 18, 2026
[Configuration] Enable MPC_EDIT_MENU and MPC_AUTOTUNE_MENU by default Open

T: Feature Request

Difficulty 1/5 Under an hour Newbie friendliness 75/100

MarlinFirmware/Marlin#28462 · 2 comments · Opened Jun 18, 2026
[BUG] Problem with scara homing Open

Bug: Potential ?

Difficulty 4/5 3-5 days Newbie friendliness 38/100

MarlinFirmware/Marlin#28441 · 12 comments · Opened May 21, 2026
[BUG] MPC causes Thermal Runaway when fan is running Open

Bug: Potential ?

Difficulty 4/5 3-5 days Newbie friendliness 38/100

MarlinFirmware/Marlin#28420 · 2 comments · 1 reaction · Opened Apr 29, 2026
[BUG] Intermittent Z homing failure on MKS TinyBee with TMC2209 standalone after successful first home Open

Bug: Potential ?

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MarlinFirmware/Marlin#28419 · 2 comments · Opened Apr 28, 2026
[FR] G29 P1 with automated supend Open

T: Feature Request

Difficulty 4/5 3-5 days Newbie friendliness 45/100

MarlinFirmware/Marlin#28408 · 3 comments · Opened Apr 22, 2026
[FR] Add firmware Z banding/"Z wobble" compensation Open

T: Feature Request

Difficulty 5/5 Over a week Newbie friendliness 35/100

MarlinFirmware/Marlin#28405 · 2 comments · Opened Apr 19, 2026
[FR] Support for using a seperate Z stop with a probe (simplified) Open

T: Feature Request

Difficulty 3/5 1-2 days Newbie friendliness 55/100

MarlinFirmware/Marlin#28393 · 1 comment · Opened Apr 15, 2026
[FR] Update to Chitu pins files adds support for 12864,CR10 and BTT TFT35 LCD screens Open

T: Feature Request

Difficulty 4/5 3-5 days Newbie friendliness 48/100

MarlinFirmware/Marlin#28392 · Opened Apr 15, 2026
[FR] Support custom kinematics (e.g. non-linear delta) Open

T: Feature Request

Difficulty 5/5 Over a week Newbie friendliness 35/100

MarlinFirmware/Marlin#28366 · 1 comment · Opened Mar 19, 2026
[FR] Adding option for backup Z-limit switch (w/probe) Open

T: Feature Request

Difficulty 4/5 3-5 days Newbie friendliness 48/100

MarlinFirmware/Marlin#28351 · 1 comment · 1 reaction · Opened Feb 25, 2026
[FR] M600 upgrade Open

T: Feature Request

Difficulty 5/5 Over a week Newbie friendliness 25/100

MarlinFirmware/Marlin#28348 · Opened Feb 21, 2026
[FR] Filament runout sensor Open

T: Feature Request

Difficulty 4/5 3-5 days Newbie friendliness 38/100

MarlinFirmware/Marlin#28347 · 1 comment · Opened Feb 21, 2026
[FR] FTM and mixing extruder : feedback and help wanted Open

T: Feature Request

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MarlinFirmware/Marlin#28339 · Opened Feb 13, 2026
[FR] How to display the number of completed print cycles in Marlin Open

T: Feature Request

Difficulty 4/5 3-5 days Newbie friendliness 38/100

MarlinFirmware/Marlin#28332 · Opened Feb 11, 2026
[BUG] BIGTREETECH GTR.1_0 mismatched env: names Open

Bug: Confirmed !

Difficulty 3/5 1-2 days Newbie friendliness 45/100

MarlinFirmware/Marlin#28315 · 4 comments · Opened Feb 1, 2026
[FR] non-linear advance Open

T: Feature Request

Difficulty 5/5 Over a week Newbie friendliness 25/100

MarlinFirmware/Marlin#28290 · 56 comments · Opened Jan 20, 2026
[BUG] SMOOTH_LIN_ADVANCE stops my printer from extruding Open

Bug: Potential ?

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MarlinFirmware/Marlin#28264 · 4 comments · Opened Jan 3, 2026
[FR] VCNL3020 driver i wrote for bed leveling Open

T: Feature Request

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MarlinFirmware/Marlin#28236 · 6 comments · Opened Dec 18, 2025
[FR] [FT Motion] Add native timer frequency to HAL Open

T: Feature Request

Difficulty 5/5 Over a week Newbie friendliness 35/100

MarlinFirmware/Marlin#28206 · 4 comments · 1 reaction · Opened Dec 5, 2025
[FR] FT_MOTION: Option to fully disable classic motion to save 16k of FLASH (and a bit of RAM) Open

T: Feature Request

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MarlinFirmware/Marlin#28163 · 6 comments · 1 reaction · Opened Nov 8, 2025
[FR] [SAFETY] extended Endstop handling (endstop mux), lowering of possible damages Open

T: Feature Request

Difficulty 5/5 Over a week Newbie friendliness 25/100

MarlinFirmware/Marlin#28110 · 1 reaction · Opened Oct 12, 2025
[FR] Color UI redesign Open

T: Feature Request

Difficulty 5/5 Over a week Newbie friendliness 25/100

MarlinFirmware/Marlin#28088 · 2 comments · Opened Oct 2, 2025
[FR] Ability to disable Live Movement when using Creality DWIN UI. Open

T: Feature Request

Difficulty 3/5 1-2 days Newbie friendliness 55/100

MarlinFirmware/Marlin#28062 · 2 comments · Opened Sep 20, 2025
[FR] (I2S stepper stream, increasing frequency or separate dir/step through i2s/gpio) Open

T: Feature Request

Difficulty 5/5 Over a week Newbie friendliness 25/100

MarlinFirmware/Marlin#28054 · 1 comment · Opened Sep 12, 2025
[FR] Clarify M119 output for endstops and filament runout sensors (add pin state info) Open

T: Feature Request

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MarlinFirmware/Marlin#28042 · 2 comments · 1 reaction · Opened Sep 7, 2025
[FR] Add proper "CNC Mode" to disable heaters and thermal checks (GT2560 Rev A+ CNC use case) Open

T: Feature Request

Difficulty 5/5 Over a week Newbie friendliness 28/100

MarlinFirmware/Marlin#28039 · 5 comments · Opened Sep 3, 2025
[BUG] Ender 3 V2 GD32F303RET6 No Display Open

Bug: Confirmed !

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MarlinFirmware/Marlin#28010 · 7 comments · Opened Aug 13, 2025
[BUG] Linear advance with k factor >0 stops print within seconds Open

Bug: Potential ? F: Linear Advance Needs: More Data

Difficulty 4/5 3-5 days Newbie friendliness 38/100

MarlinFirmware/Marlin#27999 · 12 comments · Opened Aug 4, 2025
[FR] Safer bed probing, check probe status while moving towards the probe point Open

T: Feature Request

Difficulty 5/5 Over a week Newbie friendliness 30/100

MarlinFirmware/Marlin#27997 · 6 comments · 1 reaction · Opened Aug 1, 2025
[BUG] Smooth LA causes crash while changing ZV Input Shaping params mid-print Open

Bug: Confirmed !

Difficulty 4/5 3-5 days Newbie friendliness 48/100

MarlinFirmware/Marlin#27992 · 10 comments · Opened Jul 27, 2025
[BUG] Y input shaping problem Open

Bug: Potential ? C: Motion Needs: Testing

MarlinFirmware/Marlin#27986 · 92 comments · 2 reactions · 3 assignees · Opened Jul 22, 2025
[FR] Add UC1601 LCD support Open

C: LCD & Controllers T: Feature Request

Difficulty 5/5 Over a week Newbie friendliness 30/100

MarlinFirmware/Marlin#27954 · 2 comments · Opened Jun 29, 2025
[FR] Support for SDCARD to microSD card adapters (Ender 3* + more) Open

T: Feature Request

Difficulty 4/5 3-5 days Newbie friendliness 42/100

MarlinFirmware/Marlin#27948 · 7 comments · Opened Jun 28, 2025
[BUG] SKR v2B onboard SD unreliable, sluggish access, wrong volume size Open

Bug: Potential ? Needs: More Data

Difficulty 4/5 3-5 days Newbie friendliness 38/100

MarlinFirmware/Marlin#27925 · 4 comments · Opened Jun 18, 2025
[BUG] SEGMENT_LEVELED_MOVES causes choppy movement at high speeds Open

Bug: Potential ? Needs: Discussion

Difficulty 4/5 3-5 days Newbie friendliness 38/100

MarlinFirmware/Marlin#27918 · 23 comments · 1 reaction · Opened Jun 14, 2025
[BUG] Input shaping causes build failure on STM32F070RB_malyan environment Open

Bug: Confirmed !

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

MarlinFirmware/Marlin#27913 · Opened Jun 10, 2025
[FR] Mag mounted probes Stow/Deploy options while tramming. Open

F: Calibration F: Z-Probes T: Feature Request

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MarlinFirmware/Marlin#27909 · Opened Jun 7, 2025
[FR] Rotate the print by 90, 180, and 270 degrees on square beds. Open

C: G-code Parser T: Feature Request

Difficulty 5/5 Over a week Newbie friendliness 25/100

MarlinFirmware/Marlin#27898 · 9 comments · Opened May 31, 2025
[FR] Indicate On LCD Screen Why A Filament Change Has Been Initiated. Open

T: Feature Request

Difficulty 4/5 3-5 days Newbie friendliness 42/100

MarlinFirmware/Marlin#27883 · 1 reaction · Opened May 25, 2025
[FR] Input Shaping - Damping Factor description Open

T: Feature Request

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

MarlinFirmware/Marlin#27871 · Opened May 20, 2025
[FR] Automatic z offset calibration with limit switches Open

F: Calibration T: Feature Request

Difficulty 5/5 Over a week Newbie friendliness 25/100

MarlinFirmware/Marlin#27857 · 5 comments · Opened May 14, 2025

MarlinFirmware/Marlin

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