G-Code Mix Master — Add Stripes and Gradients to 3D Prints

G-Code Mix Master is a free browser-based tool that edits G-code files to add stripes, gradients, and random color patterns to 3D prints. It supports printers with mixing hotends as well as single-extruder printers using manual filament changes, with no purge tower required.

How it works

Open an existing sliced G-code file or load the built-in sample from the demo page. Choose stripe heights, gradient transitions, or random patterns, preview the result in 3D, then save the modified G-code and print it as usual. Your files never leave your computer: all processing happens locally in your browser.

Printer compatibility

Mixing hotends with two or more extruders and adjustable mix ratios.
Single-extruder printers using M600 or manual filament-change pauses.
Standard G-code from common slicers, previewed layer by layer before saving.

Try the sample demo file to see stripes and gradients on a test print before editing your own G-code.