Reusable start, end, pause & custom G-code, managed in one place

G-code macros & snippets

Printing Smart Free Plan

A G-code macro is a block of reusable G-code that SimplyPrint runs at a set moment of the print, like the start, the end, a pause, or a filament change. You write it once in a built-in code editor, drop in variables and reusable snippets, then assign it to a single printer, a printer group, or every printer in your account. No SD-card edits, no firmware flashing, no re-pasting the same start G-code into every slicer profile.

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Start G-code, end G-code, pause and your own custom macros

Every macro is a named slot you fill with G-code. The big ones - the start G-code that homes, heats and primes before a print, and the end G-code that parks the head, cools down and presents the bed - run automatically around every job. Pause, resume, cancel, clear-bed, filament-change and more are macros too, so a button in the panel sends exactly the commands you wrote.

Macros run through SimplyPrint, not your slicer, so the same start and end routine applies no matter which slicer or profile produced the file - and you change it in one place instead of editing every profile.

A real code editor, not a tiny text box

Write your G-code in a proper editor with syntax highlighting, bracket matching and inline autocomplete for G-code commands. Hover any command or variable to see what it does, and a help panel links straight to the Marlin and Klipper G-code references while you work.

The editor recognises G-code the way an IDE recognises code, so a long start routine stays readable and you catch a typo before it ever reaches a printer.

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Variables and slicer placeholders make one macro fit every printer

Instead of hard-coding a bed temperature or a nozzle size, drop a variable like {bed_temp} or {nozzle_size} into your G-code and SimplyPrint fills in the real value for the printer and job it runs on. Start and end macros also accept slicer placeholders, so the values your slicer worked out flow straight into the routine.

A Variables menu in the editor lists everything available - standard variables, slicer placeholders and context-specific ones for the active macro - so you click to insert the exact token and never guess at a name. That is how one start G-code can serve a whole mixed fleet instead of one macro per machine.

Build a library of reusable snippets

A snippet is a named chunk of G-code you save once and reuse anywhere - a nozzle-wipe routine, a purge line, a beep-when-done, a mesh-leveling block. Insert a snippet into any macro and it expands to the real commands at run time, so when you improve the snippet, every macro that uses it updates with it.

You manage snippets in a searchable, drag-to-reorder table and pull them into the editor from a snippets menu. One fix in one place, applied everywhere you used it.

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Ready to write your G-code once?

Set your start and end G-code, save a few snippets, and let SimplyPrint run them across your fleet.

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Assign a macro to one printer, a group, or everything

Set an account-wide default macro and it applies to every printer. Pick a single printer and override just that machine - handy when one printer needs a different purge line or a custom park position. The override system shows you, at a glance, which printers differ from the default, so a fleet of twenty machines never drifts out of sync without you knowing.

For teams, organization macros apply to everyone, and individual users can keep their own personal macros that take over when they print - without touching the shared defaults.

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Marlin, Klipper and beyond - your G-code, your firmware

Macros send raw G-code, so anything your printer's firmware understands works: Marlin, Klipper, RepRapFirmware and the rest. The editor links to both the Marlin and Klipper command references, and you can call your printer's own macros from a SimplyPrint macro. It is the same model-agnostic approach as the rest of SimplyPrint - over 500 printer models from 130+ brands in one account, all driven by the G-code you write.

Preview the exact G-code before it runs

Before you commit a macro, preview the fully assembled G-code - snippets expanded, variables filled in for the printer you picked - exactly as it will be sent. You can even check it across multiple printers at once, so you confirm a fleet-wide change does the right thing on every machine before a single one runs it.

Where your macros do their work

Macros run all over SimplyPrint. These are the features they plug straight into.

Control panel

Pause, resume, cancel and clear-bed buttons run the macros you wrote.

See the control panel
Start a print

Your start G-code runs automatically the moment a print begins.

See start a print
Cloud slicer

Slicer placeholders from your profile flow into start and end macros.

See the slicer

Included on every plan

G-code macros and snippets are part of the core SimplyPrint platform - on the Free plan and every plan above it. The editor, variables, snippets and per-printer, per-group and account-wide assignment are all included, with no separate macros add-on to buy.

Frequently asked questions

A G-code macro is a block of reusable G-code that SimplyPrint runs at a set moment of a print - the start, the end, a pause, a filament change, a clear-bed, and more. You write it once in a built-in editor and SimplyPrint runs it for you, so you never re-paste the same commands into every slicer profile or onto the printer itself.
Yes. Set an account-wide default that applies to every printer, then override an individual printer when it needs its own routine - a different purge line, park position or temperature. The editor shows which printers differ from the default so a large fleet never drifts out of sync without you noticing.
Yes. Macros send raw G-code, so anything your firmware understands works - Marlin, Klipper, RepRapFirmware and others. The editor links to both the Marlin and Klipper command references, and you can call your printer's own firmware macros from a SimplyPrint macro.
Yes. Instead of hard-coding values, drop a variable such as a bed temperature or nozzle size into your G-code and SimplyPrint fills in the real value for the printer and job. Start and end macros also accept slicer placeholders, so the values your slicer calculated flow into the routine. A Variables menu in the editor lists every available token so you click to insert the right one.
A snippet is a named, reusable chunk of G-code - a purge line, a nozzle wipe, a mesh-leveling block. You insert a snippet into a macro and it expands to the real commands at run time. Improve the snippet once and every macro that uses it updates with it. Macros are the slots that run at print events; snippets are the reusable building blocks you drop inside them.
Yes. You can preview the fully assembled G-code - snippets expanded and variables filled in for the printer you picked - exactly as it will be sent. You can also check it across multiple printers at once to confirm a fleet-wide change behaves correctly on every machine first.
Yes. Organization macros apply to everyone on the account, and individual users can keep personal macros that take over when they print - without changing the shared defaults. It is a good fit for a shared lab or print farm where most printers follow a house standard but some users need their own tweaks.
G-code macros and snippets are part of the core SimplyPrint platform and are included on every plan, starting with Free. The editor, variables, snippets and per-printer, per-group and account-wide assignment are all available.

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