MarlinFirmware/Marlin

[FR] Runtime adjustable machine travel limits

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#25,582 opened on Mar 27, 2023

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 (21 comments) (2 reactions) (0 assignees)C++ (16,011 stars) (19,123 forks)batch import
F: CalibrationT: Feature Requestgood first issue

Description

Is your feature request related to a problem? Please describe.

No response

Are you looking for hardware support?

No response

Describe the feature you want

In some cases, it would be convenient to be able to change max axis movement without changing firmware, using GCODE commands, then save to EEPROM. For example, if there are no other needed changes in the firmware but you change hardware to allow more clearance or change hotend and thus reduce maximum print height.

Sorry if it was already suggested (I couldn't find any) or if it's actually possible to do.

Additional context

Disabling software endstops is not a good solution for this, as it adds risk of crashing.

Contributor guide

Tech stack
cpp
Domain
backend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
needs maintainer response
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
C++ programmingMarlin firmware architectureG code protocolEEPROM data management
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25
Research direction
Investigate the current implementation of machine limits in Marlin firmware, specifically in files like `Configuration.h`, `Marlin/src/module/motion.cpp`, and `Marlin/src/gcode/movement/G28.cpp`. Understand how software endstops are currently handled and how M503 and M500 commands work. Review the discussions in the issue comments for any suggested approaches. No linked PRs exist.
[FR] Runtime adjustable machine travel limits · MarlinFirmware/Marlin#25582 | Good First Issue