Custom G-code (Expert)

The Custom G-code module lets you import, edit, analyze, and debug real G-code inside 3dSynth. Use it to tweak slicer output, hand-author toolpaths, or understand exactly what a file does before printing.

What It Is

• Code editor -- Monaco-based editor with syntax highlighting, autocomplete, and hover docs
• Bidirectional sync -- select lines in the editor and see them in the 3D viewport; click toolpaths in 3D to jump to code
• Analysis -- outline tree (startup, layers, regions, shutdown), metrics (time, filament, flow), and structural analysis
• Visualization -- 8 color modes: speed, flow, temperature, fan, layer, and more
• Tools -- change speed/flow/temperature on selections, reorder sections, snapshot and diff

What You Can Do

• Post-process slicer output -- adjust speeds, add pauses, insert custom commands at specific layers
• Inspect any G-code -- visualize toolpaths from any slicer with color-coded overlays
• Debug line by line -- step through commands and inspect full machine state at each point
• Compare edits -- snapshot your work and diff against previous versions

When to Use It

• Post-process slicer G-code (adjust speeds, add custom commands)
• Hand-author or tweak toolpaths from G-code Sculptor or SynthBlocks
• Debug and inspect G-code from any source
• Learn G-code by stepping through commands with the debugger

Tutorials in This Section

Use the list to the left to open any of the 48 tutorials, grouped by level: Beginner (1-12), Intermediate (13-24), Master (25-36), and Expert (37-48).

Learn More

• Documentation -- Custom G-code Overview, Editor Features, Analysis, and Tools under the "Custom G-code" section in Docs