G code Preview Simulation and Breakpoints
The Preview workspace includes a G-code inspection panel, breakpoint controls, simulation playback, timeline scrubbing, and section view. Together, these tools let users inspect a sliced job before exporting or sending it to a printer.
The G-code panel opens under the preview. The header tracks the active layer, Z height, simulation state, and breakpoint count.
Each visible line includes a line number, syntax-highlighted G-code or comments, and a breakpoint button. The panel follows the selected preview layer so users can connect visible toolpaths to source commands.
Click the dot beside a source line to add a breakpoint. The selected line is highlighted, the line action changes from Add breakpoint to Remove breakpoint, and the panel header shows the breakpoint count plus a Clear BP control.
The cropped view makes the active breakpoint easier to see.
Simulation controls sit in the preview footer. They include reset, play, playback speed, scrub slider, elapsed time, total estimated time, and mode buttons.
The cropped footer view highlights the controls used during playback: reset, play, speed multiplier, scrub slider, elapsed time, Simulate, and Section.
During simulation, the preview advances through the toolpath and the G-code panel remains aligned with the active command range.
The viewport crop shows the simulated layer range while playback is active.
The speed selector supports multiple playback rates, and the scrub slider can jump through the print timeline without changing the sliced file. Use this to inspect suspicious toolpath regions, travel-heavy sections, or the layers around a breakpoint.
Section view clips the preview volume so users can inspect interior toolpaths. This is useful for checking wall order, infill density, hidden voids, and how toolpaths behave through a specific layer range.
The section viewport crop focuses on the clipped build volume and exposed toolpaths.
When section mode is enabled, a section-depth slider appears in the footer next to the simulation controls.
After inspection, the footer keeps output actions close to the preview:
- Export saves generated G-code.
- Send to Printer sends the sliced job to the configured printer.
- AI opens assistant support for review or troubleshooting.